是美加边境，你从加拿大那边入美国境

我们当时专门从底特律出境，到加拿大那边就说，cross border, just for visa purpose. We are not going to stay in Canada.

其实就是打个U turn. 再入境美国，就跟他们说, We are here for renewing my daughter's H4 status. 那个边境官笑眯眯滴说，OK, we can do this. 就把我们叫到边卡旁边的屋子里排队，很快就办好了H4.