act against

1. 违反

She acted against my will.

她违背了我的意愿。

act for

1. 代理

She acts for me in the matter.

在这件事上, 她是我的代理人。

act on/upon

1. 对……起作用

These medical herbs are said to act on the heart.

据说这些药草对心脏起作用。

2. 按照……行事

Acting on my recommendation, he has decided to read the novel once more.

按照我的劝告, 他决定把这本小说再读一遍。

act out

1. 把……表演出来

We roared when Mary acted out the episode.

当玛丽绘声绘色地描述那件事时, 我们哄然大笑起来。

2. 把……付诸行动

They are determined to act out their ideal.

她们决心把自己的理想变成行动。

act up

1. 调皮; 任性

The dogs acted up when a stranger entered the front yard.

有陌生人走进前院时, 狗就开始又叫又跳。

The boy is fond of acting up with him.

这男孩喜欢和他一同捣蛋。

2. 出毛病

My car has been acting up again.

我的车子又出问题了。

The car's engine began to act up.

汽车的发动机开始出毛病了。

act up to

1. 遵循; 履行

You must act up to your promise.

你必须履行自己的诺言。

in the act of

1. 正在……时

I was in the act of shooting her when I suddenly recognized her.

我正要向她开枪时, 忽然认出了她。