但是我看到前邊的帖子說萬一I94被加拿大海關收走,進入美國境內還需要重新簽證Yes, if you don't have an I-94, you have to get a new visa. But immigration canada (not 加拿大海關) should not ask you give them your I-94. (you don't have to give to them. Even you should not show them your I-94).