英语about的词性和用法？

about

　　a.附近;周围;各处

　　There were a lot of flowers about the house.

　　房子周围有许多花。

　　We walked about the town.

　　我们在城里到处走动。

　　b.关于：有关

　　The story is about giants.

　　这是关于巨人们的故事。

　　What's he talking about?

　　他在说什么?

　　c.大约

　　He left there about ten o'clock.

　　他大约在十点钟离开了那里。

　　d.常用词组

　　* talk about 谈论，讨论

　　Are you talking about me?

　　你们在谈论我吗?

　　* look about 环顾四周

　　The man kept looking about.

　　这个人不停地环顾四周。

　　* think about 思考，考虑

　　Please think about it carefully.

　　请仔细地思考一下。

　　* bring about 带来，导致

　　This will bring about profound impacts.

　　这将带来深刻影响。

　　* what/how about ... 怎么样

　　What about your opinion?

　　你的观点是什么?