Sean's a fast thinker, and he acts on impulse.

肖恩是个思维敏捷、凭一时冲动行事的人。

《柯林斯英汉双解大词典》

No matter how poorly he acts, you should never give him cat calls.

无论他的表演有多糟糕，你都不应该给他喝倒彩。

youdao

He's not 6 years old, even if he acts like it, so say nothing more.

即使他的行为像个孩子，他也不再是6岁的儿童，所以不要再多说什么了。

youdao

But he acts as if the job is great fun.

VOA: special.2010.03.21

There at the well, again he acts to defend the defenseless.

在水井旁，他再一次保护无助者。

耶鲁公开课 - 旧约导论课程节选

He's thought about the universe, thinks life is pointless and he acts depressed.

对于宇宙万物都有着自己的思考,他认为人生毫无意义,所以行事消极

耶鲁公开课 - 死亡课程节选

By contrast, on television, where he has been appearing more frequently, he acts with uncanny sang-froid.

NEWYORKER: No Secrets

He acts with due decency while preserving sound judgment (the musical never got made).

ECONOMIST: The man behind the myth

He knows the impression he makes is important, so, like Jobs, he acts like he doesn't think it's important.

CNN: Zuckerberg's hoodie is savvy, not snotty