letter是什么意思

　　例句：

　　1、Why write a letter to your future self?

　　为什么要给未来的自己写一封信呢？

　　2、Perhaps they are afraid the imaginary letter will come true.

　　也许他们害怕那封虚构的信会成为现实。

　　3、 An important letter served the lawyer as evidence.

　　一封重要的信件被律师作为证据。