It had to keep moving to reach San Francisco in twenty-five days as required by the government contract.

VOA: special.2010.04.26

Milton makes a covenant with the reader. It's as if he's signing a contract because he's asking for credit here.

他与读者签了契约，就好像,因为他要借款所以签了份合同一样。

耶鲁公开课 - 弥尔顿课程节选

On the other hand, if we had a quarter as much venture capital, I think that would be in the sense the world would contract too much.

换句话说，如果资金数是风险资本的四分之一，我想现在订立的合同,太多了。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

Players could sign with any team once their contract expired, as sports economist Andrew Zimbalist explains.

VOA: special.2010.07.26

It's illegal, so they can't sign that as a contract, but they they can just agree to do it.

因为是违法的,合同也就无效了,不过他们可以私下达成默契

耶鲁公开课 - 博弈论课程节选

The Thai economy is forecast to contract by as much as four percent this year, leaving as many as two million unemployed.

VOA: standard.2009.04.06

The sovereign is described by Hobbes as an artificial person by which he means the sovereign is the creation of the contract or the covenant that brought this office into being.

霍布斯把君主描述为一个,现今意义上的法人,也就是说君主的权力,是由某种意义上的合同,或说是契约而形成的。

耶鲁公开课 - 政治哲学导论课程节选