- 做，做事，行事；行动，采取行动：
We must act now to forestall disaster.
我们现在必须采取行动以防灾难。
They acted promptly in the emergency.
他们在紧急情况下立即行动起来。
- 对…发生作用，起作用，对…产生影响(常与on连用)；奏效，见效：
The medicine failed to act.
这药不起作用了。
The medicine acted on her fever at once.
这药很快就使她退了烧。
- 表现，举止：
The soldier acted like a real hero.
那个士兵的举动像一个真正的英雄。
- (在舞台上)表演，演戏，扮演角色：
He acted in two plays by Molière.
他在莫里哀编的两个剧中扮演角色。
to act in a play
在戏中扮演角色
- (角色、戏等)能被(扮)演，(角色)适于扮演；(剧本)适于上演：
The play acts well.
这剧本上演的效果好。
Her plays don't act well.
她写的戏不好演。
- 似乎在演戏，做戏，假装，做作：
The girl's not really crying; she's only acting to get your sympathy.
这女孩不是真哭，而是在做戏以博得你的同情。
Act interested even if you're bored.
即使你觉得厌烦，也假装有兴趣。
- 扮演；担当(as):
She acted as our interpreter.
她给我们当翻译。
to act as manager
担任经理
- 起某种作用，用作，当作，充当(as)：
A trained dog can act as a guide to a blind person.
受过训练的狗可以充当盲人的向导。
- 对…做出决定(或裁决)；颁发奖品(常与on 连用)：
We are required to act at the end of the meeting.
我们必须在会议结束时做出决定。
I am required to act before noon tomorrow.
我必须在明天午前做出决定。
- 作代言人，作为…的代理人，代理，代办，代表(for):
As the chairman is ill, I am asking Mr Jones to act for him.
现在主席病了，我打算请琼斯先生代理他。
In my absence the assistant manager will act for me.
我不在时由经理助理代理我。
- 显出：
She acted very angry.
她显得非常生气。