Blood is only expelled from the heart when it contracts.

心脏收缩时，血液才从心脏射出。

《柯林斯英汉双解大词典》

As it gets colder, it contracts.

当温度降下来时它就收缩。

youdao

As it contracts, it pulls on these tissues.

睫状肌一收缩，就拉动这些组织。

youdao

It said states cannot interfere with private contracts creating corporations.

VOA: special.2010.03.05

Then you're not supposed to ever do anything that's not honest or not living up to contracts, but your purpose is only one purpose: it's the shareholder.

所以你不能做任何,不诚实或者不符合合同要求的事,你的服务人群只有一个,就是股东

耶鲁公开课 - 金融市场课程节选

The reason the mafia thrives in countries where it's hard to write legal contracts-- let's say some new parts of the former Soviet Union or some parts of Africa the reason the mafia thrives in those environments, is that it substitutes for the law and enforces both legal and illegal contracts.

黑恶势力在那些,书面协议不受保护国家不断壮大,比如前苏联新成员国 或者非洲,为什么黑恶势力在这些地方发展壮大,因为这是法律强制力的补充,它维系所有合同,不管是不是合法的

耶鲁公开课 - 博弈论课程节选

It contracts some tax and accounting advice from PricewaterhouseCoopers and uses Bankers Trust as a custodian.

FORBES: Achieving immortality via the family office

An economy is generally considered to be in recession if it contracts for two consecutive quarters.

BBC: UK services sector grew in January

An economy is considered to be in recession if it contracts for two consecutive quarters.

BBC: UK to avoid triple dip recession, says BCC