签证是一种官方背书,允许你进入一个你不是合法居民的国家. 签证将规定你被允许停留的时间, 指定您逗留的状态, and the activities in which you are allowed to engage while you are in the country on that status. It is usually in the form of a stamp or sticker affixed to one of the pages of the passport.

*我们的一些项目要求你在出发前申请签证.