She is acting as proxy for her husband.

她做她丈夫的代表。

《牛津词典》

He is acting as liaison with the film crew.

他担任拍摄组的联络员。

《柯林斯英汉双解大词典》

I'm acting as deputy till the manager returns.

我在经理回来之前代行他的职务。

《牛津词典》

Then,the car automatically switches to a gas-powered engine, acting as a generator that can power through 483 more kilometers.

VOA: standard.2010.07.30

And the reason for this, and this is a very important point about the photoelectric effect, and the point here is that the electrons here are acting as particles, you can't just add those energies together.

这个现象的原因是，这是光电效应非常重要的一个论点,这个论点就是电子,在这里是粒子行为，你不能仅仅把这些能量加在一起。

麻省理工公开课 - 化学原理课程节选

But I think as you get older, like when you were younger, you might want to do acting

但是我觉得你胆子大一些的时候，比如小的时候，你可能想当演员，

演技要磨练出来 - SpeakingMax英语口语达人

But villagers appealed and James Dingemans QC, acting as Deputy High Court Judge, quashed the decision.

BBC: Great Ryburgh villagers win lorry park court case

That has caused some alarm because China was acting as the engine of global growth.

ECONOMIST: Buttonwood

Our soldiers are acting as social workers, but dodging bullets and IEDs in the process.

FORBES: Forget Afghanistan; Let's Rebuild America