They're lenses because they're convex vessels, and when they're full of water, they act as a lens and you see the horizon in them, upside down and backwards.

它们是透镜，因为它们是凸面容器，当它们盛满水后，它们可作为透镜使用，你可以看到它们里面上下颠倒的地平线。

youdao

They need to think before they act and make good decisions for themselves.

他们需要三思而后行，为自己做出正确的决定。

youdao

And they act on their belief.

并且他们也按这一信念行动起来。

youdao

But if they act too soon and raise interest rates too much, the economy could crash again.

VOA: special.2009.08.28

How do you influence the way people connect the way they think about something and the way they act about something.

您是怎样影响人们,让人们将其所想与,所为联系起来的呢？

普林斯顿公开课 - 人性课程节选

And they're altruistic because they act to preserve other animals that share the same genes.

说它们利他，是因为它们会保护其他动物,和它们有同样基因的动物。

耶鲁公开课 - 心理学导论课程节选

But even if they act, the rats will just scurry to another garbage can.

FORBES: Con.com

That becomes a complication when they act like they do in the United States.

FORBES: Labor Trouble In 'Lack-land'

And therefore, if patients don't have the information, how can they act on it?

NPR: Confronting Misconceptions About Cancer Prevention