s**a
发帖数: 1995 | 1 I'm reading by Phil Burt.
In this book, it says "The patello-femoral (膝 - 股骨) joint is a
particularly smooth cartilage surface. With a co-efficient of friction nine
times that of ice sliding over ice. For this reason, a number of factors
that can cause the patella to move too far out of the groove can cause pain." | c********e
发帖数: 1339 | | h*******s
发帖数: 3094 | 3 实在不是我不想混车版，问题是比游泳版还看不懂啊！现在满脑子都是推娃上课的事情
。 |
|
