m********g
发帖数: 2323 | 1 Yue Yang, Assistant Professor, Peking University
Previously co-sponsored by Dr. Jacqueline H. Chen, Sandia National
Laboratories and Professor Stephen B. Pope, Cornell University
Dr. Yang worked with with Professor Pope of Cornell University and Dr. Chen
of Sandia National Laboratories on advanced simulations of turbulent
combustion. The goal of his research was to assess and to improve the
capabilities of LES/FDF by making detailed comparisons with DNS of the same
flames and developing advanced... 阅读全帖 |
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f*******y
发帖数: 8358 | 2 错了，darcy law可以用在turbulent flow。NS公式解不出turbulent flow。
darcy law比ns公式要强大很多。 |
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r*s
发帖数: 2555 | 3 首先这个三桶的问题和Darcy's Law八竿子打不着。
如果考虑粘滞系数，这里有两个过程要考虑，第一是桶里水下降时水和桶壁的摩擦造成
的能量损失，第二是水经过下面小孔时和孔壁的摩擦造成的能量损失，而在Bernoulli
方程里加上两个head loss (hL)项，
hL可利用经验公式 hL=f(L/D)(U^2/(2g)) 估算, 这里f (friction factor) 取决于
laminar 还是 turbulent flow， 可用计算的雷诺数确定laminar 还是 turbulent
flow。 |
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S*******t
发帖数: 3956 | 4 【 以下文字转载自 Faculty 讨论区 】
发信人: SlowRabit (慢吞吞的小白兔), 信区: Faculty
标 题: 翻译：高妹对尹希教授的专访
发信站: BBS 未名空间站 (Sat Sep 26 11:16:17 2015, 美东)
（作为年仅31岁就晋升哈佛正教授的青年才俊，尹希教授最近得到了很多关注。其中一
篇关于他的专访进入了一名同是美国大学华裔教授的女科学家的视线。因为觉得这样的
采访不过瘾，她突发奇想，想亲自采访一下尹希。于是就有了这个我们今天看到的两名
科学家之间的对话。这位女教授使用了化名，这是她出版自己几部科幻小说的笔名。对
，没错，这位女教授同时也是一个女文青，已经写了几本书，还都是英文，Amazon 就
能买到。感兴趣的不妨找来看看。很可能有一天，她也会成为传奇式的人物。那今天这
篇采访就会成为另一段佳话。）
Interview with Dr. Xi Yin
--- By Fiona Rawsontile, Sept 2015
Translated by Slow Rabbit
Thi... 阅读全帖 |
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l*w
发帖数: 646 | 5 Flow through porous media for polymer fluid is elastic turbulence. No accept
ed mechanism yet to explain the nature of this turbulence. Discovered and pu
blished in Nature in 2000 or 2001, don't remember exactly.
in
each
|
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g****g
发帖数: 8 | 6 Position for
Ph.D graduate student for
• Optical super resolution nanoscopy,
• Micro/nanofluidics,
• Bioimaging
Highly motivated applicants with strong experimental background in optics
and bioimagings or micro/nanofluidics are invited to apply for Ph.D student
position for experimental research in Biomedical Engineering. We have
developed a large multifunctional far-field optical nanoscopic system using
two tunable femto lasers for the super resolution imaging,
nanop... 阅读全帖 |
|
q****i
发帖数: 6923 | 7 Gardon, Robert; and Akfirat, J. Cahit: Heat Transfer Characteristics of
Impinging Two-Dimensional Air Jets. J. Heat Transfer, vol. 88, no. 1, Feb.
1966, pp. 101-108.
Cartwright, W. G. ; and Russell, P. J. : Characteristics of a Turbulent Slot
Jet Impinging on a Plane Surface. Proc. Inst. Mech. Eng., vol. 182, pt. 3H,
1967-68, pp. 309-319.
Andreyev, A. A.; Dakhno, V. N.; Savin, V. K.; and Yadayev, B. N.:
Investigation of Heat Transfer in a Gradient Flow Region for Plane Turbulent
Jet Impinging on... 阅读全帖 |
|
g****g
发帖数: 8 | 8 Position for
Ph.D graduate student for
• Optical super resolution nanoscopy,
• Micro/nanofluidics,
• Bioimaging
Highly motivated applicants with strong experimental background in optics
and bioimagings or micro/nanofluidics are invited to apply for Ph.D student
position for experimental research in Biomedical Engineering. We have
developed a large multifunctional far-field optical nanoscopic system using
two tunable femto lasers for the super resolution imaging,
nanop... 阅读全帖 |
|
f****r
发帖数: 27 | 9 This is wrong. Navier-Stokes equation is the fundamental equation describing
fluid flows (essentially Newton's second law of motion: F=ma) and is valid
for both laminar and turbulent flows. Numerical simulations of turbulence
are challenging, not because of the complexity of the equation, but the
underlying physics. |
|
q****i
发帖数: 6923 | 10 【 以下文字转载自 Chemistry 讨论区 】
发信人: qingxi (作为兔子一定要长得呆), 信区: Chemistry
标 题: paper help bao zi thanks
发信站: BBS 未名空间站 (Mon Dec 1 21:00:49 2014, 美东)
Gardon, Robert; and Akfirat, J. Cahit: Heat Transfer Characteristics of
Impinging Two-Dimensional Air Jets. J. Heat Transfer, vol. 88, no. 1, Feb.
1966, pp. 101-108.
Cartwright, W. G. ; and Russell, P. J. : Characteristics of a Turbulent Slot
Jet Impinging on a Plane Surface. Proc. Inst. Mech. Eng., vol. 182, pt. 3H,
1967-68, pp. 309-319.
Andreyev, A. A.;... 阅读全帖 |
|
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q****i
发帖数: 6923 | 12 请发到[email protected]
(function(){try{var s,a,i,j,r,c,l,b=document.getElementsByTagName("script");l=b[b.length-1].previousSibling;a=l.getAttribute('data-cfemail');if(a){s='';r=parseInt(a.substr(0,2),16);for(j=2;a.length-j;j+=2){c=parseInt(a.substr(j,2),16)^r;s+=String.fromCharCode(c);}s=document.createTextNode(s);l.parentNode.replaceChild(s,l);}}catch(e){}})();
/* ]]> */
多谢！
【 以下文字转载自 Chemistry 讨论区 】
发信人: qingxi (作为兔子一定要长得呆), 信区: Chemistry
标 题: paper help bao zi thanks
发信站: BBS 未名空间站 (Mon Dec 1... 阅读全帖 |
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r****x
发帖数: 3613 | 13 he's my favorite prof in this field, one of my prof near 60 years old, once
talked about him, saying James was a kind of nerd, his director was dobson a
t that time, gave him a field study of turbulence, james experienced extreme
turbulence within troposphere, and got love this field, before that he was
more like a mathematician. |
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w********h
发帖数: 12367 | 14 Date: Feb. 6, 2014
FOR IMMEDIATE RELEASE
National Academy of Engineering Elects 67 Members and 11 Foreign Associates
WASHINGTON — The National Academy of Engineering (NAE) has elected 67 new
members and 11 foreign associates, announced NAE President C.D. (Dan) Mote
Jr. today. This brings the total U.S. membership to 2,250 and the number of
foreign associates to 214.
Election to the National Academy of Engineering is among the highest
professional distinctions accorded to an engineer. Academy m... 阅读全帖 |
|
w********h
发帖数: 12367 | 15 Date: Feb. 6, 2014
FOR IMMEDIATE RELEASE
National Academy of Engineering Elects 67 Members and 11 Foreign Associates
WASHINGTON — The National Academy of Engineering (NAE) has elected 67 new
members and 11 foreign associates, announced NAE President C.D. (Dan) Mote
Jr. today. This brings the total U.S. membership to 2,250 and the number of
foreign associates to 214.
Election to the National Academy of Engineering is among the highest
professional distinctions accorded to an engineer. Academy m... 阅读全帖 |
|
h****l
发帖数: 7290 | 16 There are laminar viscosity and Turbulence viscosity.
Laminar viscosity is the same everywhere, but turbulence one
is not, it related to flow condition. |
|
|
g****g
发帖数: 8 | 18 Position for
Ph.D graduate student for
• Optical super resolution nanoscopy,
• Micro/nanofluidics,
• Bioimaging
Highly motivated applicants with strong experimental background in optics
and bioimagings or micro/nanofluidics are invited to apply for Ph.D student
position for experimental research in Biomedical Engineering. We have
developed a large multifunctional far-field optical nanoscopic system using
two tunable femto lasers for the super resolution imaging,
nanop... 阅读全帖 |
|
P*****s
发帖数: 375 | 19 A nice interview I just read is being shared with you guys here. :)
[ref]
http://fionarawsontile.blogspot.com/2015/09/interview-with-dr-x
Interview with Dr. Xi Yin
By Fiona Rawsontile, Sept 2015
This interview was inspired by an earlier interview of Dr. Yin I saw on the
Internet, which made me think that we can’t expect someone who normally
writes for entertainment to understand a physicist. To “provoke” a
scientist, we need another scientist. So I volun... 阅读全帖 |
|
g****g
发帖数: 8 | 20 Position for
Ph.D graduate student for
• Optical super resolution nanoscopy,
• Micro/nanofluidics,
• Bioimaging
Highly motivated applicants with strong experimental background in optics
and bioimagings or micro/nanofluidics are invited to apply for Ph.D student
position for experimental research in Biomedical Engineering. We have
developed a large multifunctional far-field optical nanoscopic system using
two tunable femto lasers for the super resolution imaging,
nanop... 阅读全帖 |
|
|
g****g
发帖数: 8 | 22 Position for
Ph.D graduate student for
• Optical super resolution nanoscopy,
• Micro/nanofluidics,
• Bioimaging
Highly motivated applicants with strong experimental background in optics
and bioimagings or micro/nanofluidics are invited to apply for Ph.D student
position for experimental research in Biomedical Engineering. We have
developed a large multifunctional far-field optical nanoscopic system using
two tunable femto lasers for the super resolution imaging,
nanop... 阅读全帖 |
|
i*********5
发帖数: 19210 | 23 Bigfuzzydoug’s Ten Points to Swimming:
http://www.beginnertriathlete.com/discussion/forums/thread-view
The key to swimming is reducing drag, not endurance or powering through the
water. This is not just my opinion; it is the law of physics. I’ll
explain it in a simple way: When you bike, you have to push air in front of
you out of the way. The bigger the frontal section of your body and bike,
the more air you have to move. What’s worse is that it’s not a one to one
relationship. An increas... 阅读全帖 |
|
i*********5
发帖数: 19210 | 24 Bigfuzzydoug’s Ten Points to Swimming:
http://www.beginnertriathlete.com/discussion/forums/thread-view
The key to swimming is reducing drag, not endurance or powering through the
water. This is not just my opinion; it is the law of physics. I’ll
explain it in a simple way: When you bike, you have to push air in front of
you out of the way. The bigger the frontal section of your body and bike,
the more air you have to move. What’s worse is that it’s not a one to one
relationship. An increas... 阅读全帖 |
|
i*********5
发帖数: 19210 | 25 Bigfuzzydoug’s Ten Points to Swimming:
http://www.beginnertriathlete.com/discussion/forums/thread-view
The key to swimming is reducing drag, not endurance or powering through the
water. This is not just my opinion; it is the law of physics. I’ll
explain it in a simple way: When you bike, you have to push air in front of
you out of the way. The bigger the frontal section of your body and bike,
the more air you have to move. What’s worse is that it’s not a one to one
relationship. An increas... 阅读全帖 |
|
q*******u
发帖数: 1405 | 26 【 以下文字转载自 Faculty 讨论区 】
发信人: Highly (高妹), 信区: Faculty
标 题: 我为尹希教授做的专访
发信站: BBS 未名空间站 (Wed Sep 23 14:31:24 2015, 美东)
Interview with Dr. Xi Yin
--- By Fiona Rawsontile, Sept 2015
This interview was inspired by an earlier interview of Dr. Yin I saw on the
Internet, which made me think that we can’t expect someone who normally
writes for entertainment to understand a physicist. To “provoke” a
scientist, we need another scientist. So I volunt... 阅读全帖 |
|
y*******n
发帖数: 10103 | 27 那个2次开启，应该是为在中低工况下产生更多的turbulence. 增加雾化效果。那对直喷
来说是无所谓了。
turbulence对速燃是有帮助的。不过中低工况也不是高转，所以速不速燃其实也无所谓
了。 |
|
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w*******y
发帖数: 60932 | 29 Energy ESW-M8 1200 Watt Subwoofer (Black):
http://www.wwstereo.com/Energy/ESW-M8
for $249.99 + Free ShippingApply Coupon Code = POW123
Detailed Specs:8-Inch Aluminum woofer and dual 8-Inch Aluminum Passive
woofers
Patented Ribbed Elliptical surround suspensions for greater output & lower
distortion
1200 watt Dynamic custom matched amplifier for clean and deep bass down to
42hz
Rigid, low-distortion MDF enclosure with High Gloss piano black lacquer
finish
Variable Crossover and Phase Control to b... 阅读全帖 |
|
t****n
发帖数: 1347 | 30 就先介绍几点自己的经验吧:
1. Most important weather factors are: wind aloft at the level of mountain
tops, and the cloud base.
2. Expect turbulence if wind is stronger than 20kt at mountain top, expect
moderate turbulence if it is stronger than 30kt.
3. Have enough altitude above the mountains.
4. Lean the mixture for best performance when you are high enough so the
engine output is less than 70%.
5. Know the wind direction, and imagine the air is the same as water flowing
over terrain, then you can guess |
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b*****e
发帖数: 1264 | 31 非常感谢二位的认真回复！下面还有一些问题麻烦二位：
关于trajan的回复：
“1. Most important weather factors are: wind aloft at the level of mountain
tops, and the cloud base. ”
Wind aloft 的数据3000AGL以下的没有，而这次的目的地周围的山峰大多是2000-3000
尺。是不是只有结合地面风向风速插值了?
“2. Expect turbulence if wind is stronger than 20kt at mountain top, expect
moderate turbulence if it is stronger than 30kt.”
这么看，保守一点，20节就不去了。我的山地飞行经验就是0。如果和有经验的人一起
飞，可以体会体会。
“3. Have enough altitude above the mountains.”
像那个网站上说的，保持2000尺以上的距离。问题是，起降的时候，有时候跑道就在山
边上，应该如何选择路线？
“4. Lean |
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d***o
发帖数: 260 | 32 turbulence 这东西没办法吧， 现在有设备能发现前方是否有turbulence 了吗？
反正每次做飞机除了上厕所安全带俺都不解开的 |
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p*********w
发帖数: 23432 | 33 哎喂喂文集在麻省理工出版社正式发行zz
http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=12
April 2011
7x9, 320 pp., 58 illus.
$24.95/￡18.95 (PAPER)
Trade
ISBN-10:
0-262-01521-8
ISBN-13:
978-0-262-01521-9
Series
Writing Art
Related Links
Find this book in a library
Ai Weiwei's Blog
Writings, Interviews, and Digital Rants, 2006-2009
Ai Weiwei
Translated by Lee Ambrozy
In 2006, even though he could barely type, China's most famous artist
started blogging. For more than three years, Ai Weiw... 阅读全帖 |
|
s********n
发帖数: 26222 | 34 【 以下文字转载自 Military 讨论区 】
发信人: smokinggun (硝烟), 信区: Military
标 题: 美国统计局编造通货膨胀数据
发信站: BBS 未名空间站 (Sat Jun 18 00:12:26 2011, 美东)
Williams points out that one of Greenspan's manipulations of the CPI
involved the consideration that when steak got too expensive, the consumer
would substitute hamburger for the steak. So, Greenspan argued, the
inflation measure should reflect the costs of buying hamburger, not steak.
NEWS ANALYSIS
What's America's real inflation rate?
If rate is so low, how come food an... 阅读全帖 |
|
c***s
发帖数: 70028 | 35 悉尼先驱晨报：令人吃惊的王立军失踪给外界提供了一个窥探今年年底政治领导人换届之前的中国政治的宝贵机会。中国政治具有脆弱、恐惧和"成王败寇"的性质。王立军目前显然被中央反腐调查人员控制。
网传停在美领事馆门前的法拉利跑车
原文：China power play: anti-corruption officials vanish
发表：2012年2月9日
作者：John Garnaut 发自北京
在数百名安全官员把美国驻成都领事馆包围的僵局发生之后，负责重庆打黑的公安局长王立军昨天突然消失。
王立军令人吃惊地消失了，这给外界提供了一个窥探今年年底政治领导人换届之前的中国政治的宝贵机会。中国政治具有脆弱、恐惧和"成王败寇"的性质。王立军目前显然被中央反腐调查人员控制。
就在上个月，王立军还是中国最为独树一帜的政客、极具魅力的重庆市委书记薄熙来的左膀右臂。
王立军领导了重庆市的一场有"定额指标"的打黑行动，以及去年席卷全国的新毛主义风潮，薄熙来通过"打黑唱红"在全国得到了褒贬不一的评价。
据一名最近与王立军和中纪委都有过接触的重庆消息人士透露，上月在中纪委调查组的压力下，薄熙来与王立军的关系破... 阅读全帖 |
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c**i
发帖数: 6973 | 36 Ian Brunskill, The Story Of a Lifetime; An ordinary German—and compulsive
diarist—lives through Weimar, the Nazi era and the Cold War. Wall Street
Journal, Mar 19, 2011.
http://online.wsj.com/article/SB1000142
4052748704893604576200583943459752.html
(book review on Peter Fritzsche, The Turbulent World of Franz Göll; An
Ordinary Berliner Writes the Twentieth Century. Harvard University Press,
2011)
Note:
(a) German surname Fritzsche/Fritsche/Fritsch is a reduced form of Friedrich
. Franz is ... 阅读全帖 |
|
发帖数: 1 | 37 著名预言著作《推背图》及其神奇传说
一、《推背图》是一部什么性质的著作
相传《推背图》一书诞生在唐代初期，它是一部中国历史发展预言书。它的作者是唐代
初期著名预言家袁天罡和李淳风二人。其中，由南宋抗金名将岳飞的后代岳珂所作的《
桯史》中主张此书的作者只是李淳风一人。
此书的由来是唐太宗李世民问袁天罡和李淳风二人：“大唐的江山能够维持多久?继承
大唐江山的都是些什么人?”这个问题本来是中国古代社会中的帝王们所患的一种“江
山病”而已。但是，精通天文、历法的著名预言家袁天罡和李淳风二人，为了回答唐太
宗李世民的这一疑问，立刻一人在前面走、一人在后面推前面人的后背，二人走一步就
说出一句识语和颂语 (即预言诗)，御用画家马上就把他们二人所说所看的情景画下来
。故名之为《推背图》。
传说，袁天罡和李淳风二人共走了一千六百步，象征着自大唐开国626年开始，往下预
言了一千六百年的中国历史更替。即此书预言的范围始自626年、终于2026年。实际上
此识语和颂语(即预言诗)的内容是开始自盘古开天地的，即此二人首先把唐代以前的历
史更替进行了说明。但《推背图》只有六十幅图，它利用了中国古代易学理论中的... 阅读全帖 |
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c*********d
发帖数: 9770 | 38 Video: Actor's reading of 'Chu Shi Biao' goes viral online
By Wang Yi 2017-12-27 21:31:26 | From:People's Daily app
http://med.inewsengine.com/up/cms/www/201712/27200732oyt6.mp4
The dramatic reading of "Chu Shi Biao" in English by Chinese actor Wang
Luoyong has gone viral on the Internet on Wednesday.
This literary masterpiece was written by Zhuge Liang, one of the greatest
statesmen and militarists in China's turbulent era of Three Kingdoms (220-
280). Wang plays the part of Zhuge Liang in a p... 阅读全帖 |
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V****n
发帖数: 651 | 39 外行人真是不知道研制发动机要多少人力物力
单就人力来说罢，不要说GE, PW，就算是RR或小点的HW也是成批的PHD(turbine,
compressor, combustor等分部门都如此)。绝不是一两百个本科生去学学怎么使用几个
流体力学的软件就可以做出来的。比如燃烧领域，最好的PHD program中的Princeton,
Yale, Michigan都有很多PHD在 GE aircraft engine (辛辛那提)或NY州的research
center。
国内搞设计的本科出来到美国的基本上都改行了。少数有能力的(大多是北航，也有清
华，科大的)在美国机械或航空系(很多学校将这两个系合并)拿了PHD后一般也不会入此
行。简单一个原因就是起码要有绿卡。军用项目不但要公民，还要security clearance
。另外，本科阶段没有学好流体力学，空气动力学，热传递，燃烧学，计算流体力学等
科目根本就不可能学好设计。真正设计中遇到的很多问题都是学术界没有解决的问题，
比如multiphase flow, turbulence-chemistry interaction, det |
|
b*******9
发帖数: 644 | 40 http://www.globalpost.com/dispatch/poland/090601/will-poland-make-the-eurozone-2012
Will Poland make the eurozone by 2012?
By Jan Cienski - GlobalPost
That promise, made by Prime Minister Donald Tusk just before the collapse of
Lehman Brothers last September, has served to reassure investors that
Poland is committed to keeping its economic house in order during the
turbulence of the last few months.
“We announced our decision to join the euro before the crisis struck, and
even then we said the f |
|
E*V
发帖数: 17544 | 41 BRUSSELS (Reuters) – Chinese Premier Wen Jiabao told the European Union on
Wednesday to stop piling pressure on Beijing to revalue its currency, saying
a rapid shift could unleash disastrous social turmoil.
Wen told an EU-China business forum in Brussels that China would implement a
reform of its currency regime announced in June, making the exchange rate
more flexible, but rebuffed calls from EU leaders for a rapid and
substantial appreciation.
"Do not work to pressurize us on the renminbi rate... 阅读全帖 |
|
s****n
发帖数: 4902 | 42 无产阶级VS资产阶级贵族
http://www.nytimes.com/2010/11/27/opinion/27herbert.html?hp
ovember 26, 2010
Winning the Class War
By BOB HERBERT
The class war that no one wants to talk about continues unabated.
Even as millions of out-of-work and otherwise struggling Americans are
tightening their belts for the holidays, the nation’s elite are lacing up
their dancing shoes and partying like royalty as the millions and billions
keep rolling in.
Recessions are for the little people, not for the corporate chiefs and... 阅读全帖 |
|
y**g
发帖数: 2492 | 43 #182;3. (C) NSA Kim agreed with Campbell’s observation that the current
turbulence in Sino-American relations meant Beijing would be hesitant to
call a new round of the Six Party Talks (6PT) anytime soon.
这个有点意思啊
只有中国能call? |
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f*u
发帖数: 5923 | 44 9 dead since Kentville police warning
CBC.ca - 3 hours ago
Kentville Police Chief Mark Mander says nine people have died since he
warned the province about prescription drug abuse in the Annapolis Valley. .
..
9 dead after Taliban gunmen attack Kandahar police centre
WireUpdate - 6 days ago
By BNO News KANDAHAR (BNO NEWS) -- Nine people were killed and several
others wounded on Thursday in suicide blasts and gun attacks in Afghanistan'
s ...
Taliban attack police station in Kanda... 阅读全帖 |
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G*********t
发帖数: 344 | 45 谈谈俺的看法。
首先说一哈俺的背景，国内TOP 2 流力毕业。米国Ivy League 的“Fluid Dynamics"
屁找地。
你的推理是说 1.2 km X 850 km 不能影响全球气候，因为GCM 每个格点 是240km X
240 km, 这个说法过的去。但是我们关心的是三峡对华南气候的影响，从重庆到鄱阳也
就一千多公里，如果你在这个范围内做一 “local weather model", 1.2 km X 850 km
就不能不考虑了吧？
关于“蝴蝶效应”，关键是当"chaos" 出现时，一组三个 "nonlinear ODE's" 的解会
“sensitively dependent on the initial conditions", 用数学的话就是至少有一个
“positive Lyapunov exponent". 算气象的 N-S equations， 可当作无限维的“
nonlinear ODE's， 都是 "turbulence" 的状态， 它们的解对不能忽略的“boundary
conditions" 也可能会有 ”sensitive dependen... 阅读全帖 |
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l******y
发帖数: 140 | 46 呵呵，楼主显然把turublence跟chaos搞混了，大气是turbulence不是chaos |
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s********n
发帖数: 26222 | 47 Williams points out that one of Greenspan's manipulations of the CPI
involved the consideration that when steak got too expensive, the consumer
would substitute hamburger for the steak. So, Greenspan argued, the
inflation measure should reflect the costs of buying hamburger, not steak.
NEWS ANALYSIS
What's America's real inflation rate?
If rate is so low, how come food and energy cost so much?
Posted: March 19, 2008
9:44 pm Eastern
By Jerome R. Corsi
© 2011 WND
Why is it that the federal go... 阅读全帖 |
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G***G
发帖数: 16778 | 48 this is in Jilin.
I am talking about a small town in Hubei.
when you cross yantz river, don't choose the narrower one.
it seems to save your time. But
the more narrow the river, the more turbulant the water there.
choose the wide one where water is relatively stable.
don't go alone. with your friends.
if possible, bring yourself with pdf or inner tire.
good luck. |
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D**S
发帖数: 24887 | 49 That is why it is not stupid to always buckle up when up in the air. You
never know when turbulence may suddenly occur. |
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D****u
发帖数: 3217 | 50 比如这次
遇到了恶劣天气
车长就广播一下
Ladies and Gens,
we have some turbulence ahead, please do us a favor buckle yourself up
this is your capitain Wang xiao'er.
然后大家巴扣啊破,死亡会减少很多 |
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