举例：
1.大约；左右
It costs about $10.这大约要花10元钱。
2.关于；对于
Tell me all about it.把这件事全部告诉我。
3.目的是；为了；涉及…方面
What was all that about?这到底是怎么回事?
4.忙于；从事于
Everywhere people were going about their daily business.无论哪里人们都在忙着干日常工作。
5.将近；几乎
I'm just about ready.我就要准备好了。