现在从机场进入美国后，是不需要在网上打印I94了吗？ https://i94.cbp.dhs.gov/I94/#/apply-document
以前网上打印I94的网站显示这个消息。
U.S. Customs and Border Protection has automated Form I-94 at air and sea
ports of entry. You do not need to use the website to apply for an I-94; you
will be provided an electronic I-94 at the air or sea port of entry by the
CBP Officer.
什么是“electronic I-94”？从哪里得到这个electronic I-94？
