副词
请客
天气
道别
1. 又一次；再一次
You use again to indicate that something happens a second time, or after it has already happened before.
2. 还原；复原
You use again to indicate that something is now in a particular state or place that it used to be in.
3. （表示与前一话题相似）同样
You can use again when you want to point out that there is a similarity between the subject that you are talking about now and a previous subject.
4. （用于对比或语气的削弱）不过，然而
You can use again in expressions such as but again ,then again, and there again when you want to introduce a remark which contrasts with or weakens something that you have just said.
5. （用于问题后）请再说一遍
You can add again to the end of your question when you are asking someone to tell you something that you have forgotten or that they have already told you.
6. 还，另，再（多一半等）
You use again in expressions such as half as much again when you are indicating how much greater one amount is than another amount that you have just mentioned or are about to mention.
7. 再三；反复
You can use again and again or time and again to emphasize that something happens many times.