The book remains at rest or, in physical terminology, in static equilibrium not because there are no forces acting on it but because the forces which do act on it annul one another.

此书处于静止，或者用物理术语来讲处于静力平衡，并不是因为没有力作用在它上面，而是因为作用其上的力彼此互相抵消。

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The results suggested that people do act differently if they think they are working with a group for a short period of time instead of a long period.

VOA: special.2009.03.03

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

But the most central act of eating, of course, in Milton's great epic obviously has nothing to do with angels.

但最重要的吃的行为当然，弥尔顿最伟大的叙事诗显然和天使无关。

耶鲁公开课 - 弥尔顿课程节选

Jane: If there is evidence of poor or dangerous workmanship Corgi do act.

BBC: Frontline Scotland graphic

So-called probiotics, a mixture of about half a dozen bacterial species found in yogurt, do act to calm this condition.

ECONOMIST: Modern medicine

History shows that when the central banks do act, it usually takes them many months, or even years, to withdraw sufficient money to quell the inflation fires they lit.

FORBES: What's The Trigger That Will Cause The Fed To Act?