回复：回复：请问：H1, F1身份登陆加拿大返美需要签证吗？

看了pijiang的链接，困惑的是：如何理解
https://www.nvars.com/Production/userhome.aspx
里面的这段话？

Beginning March 17, 2003, ALL landed immigrants in Canada (including those individuals from a British Commonwealth country) seeking to enter the United States as non-immigrants must possess a valid passport and non-immigrant visa in order to enter.

要是入境的时候，边境官员死扣这句话，非要一个能看得见摸得着的签证，那我这样的在美国从F1换成H1，还一直没有出过境的，又没有去申请签证的，岂不是死翘翘了？
期待解惑中。