Definition: the public system that exists for the collecting and delivering of letters Level: A2
我的信一定是在邮寄过程中弄丢了。
My letter must have got lost in the ___post.
如果你不想亲自送过去，你可以邮寄。
If you don't want to take it there, you can just send it by ___post.
所以你必须邮寄它。
So you have to send it by ___post.
