They tend to act out of impulse.

他们往往冲动行事。

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Some even act out of sheer altruism.

有些行为甚至完全是利他的。

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Although it's unlikely a person will behave differently simply because of their hair colour, they may act out of character if they are being treated badly, or according to a stereotype.

尽管一个人不太可能仅仅因为发色就举止反常，但如果别人对他们不客气，或者抱有成见，他们有可能行为不当。

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The victims are pulled out of rubble. Medical personnel act quickly to respond to injuries and save lives.

VOA: standard.2010.07.26

This was an act of compulsion, and the poet had to be forced to press this lyric out of himself.

这是一个强迫性的行为,诗人被迫绞尽脑汁写出这首诗来。

耶鲁公开课 - 弥尔顿课程节选

Act for them, to them. Don't act as if they are just some bunch of Philistines out there who can't appreciate your art.

为他们表演，想他们表演，不要把它们当做俗气的人,所以不能欣赏你们的艺术。

耶鲁公开课 - 1945年后的美国小说课程节选

Instead, they act out of impulse, rushing and racing to buy products filling the needs and desires of ruthless marketers, rather than their own.

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And you won't act out of character while you're hypnotised.

BBC: Hypnotherapy session

But for all the work that it does in its continent, South Africa is almost paranoically careful not to throw its economic and diplomatic weight around or to act out of step with its African partners.

ECONOMIST: Africa's hegemon