forward和swap区别

forward是转发的意思，而swap则是交换的意思，区别可以从以下例子看出：

I have received that book, and swap it with my friend with another book, but I can ask him forward it to you after he finishes it. 我收到了那本书，并与我的朋友交换了另一本书，但我可以请他完成后将其转发给您。