If you rat someone out in jail, someone puts a contract out on you.

如果你坦白了,你是在自找麻烦

耶鲁公开课 - 博弈论课程节选

And then they ended up buying out their contract and touring themselves around.

然后他们结束了合同，并自己去巡演。

记忆犹新的表演 - SpeakingMax英语口语达人

You put some inputs in, it has a contract that says if you put the right kind of inputs in you'll get a specific output coming out, but you don't have to know what's inside of that box.

你可以将输入一些内容,它相当于一个条件合约,如果你的输入是正确的，你就能得到特定的输出,但是你不知道盒子里面有些什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

Machiavelli speaks of the prince, while Hobbes speaks of the sovereign, that is a kind of impersonal or in Hobbes' language, artificial power created out of a contract.

马基雅维利探讨君主，而霍布斯则探讨主权，这算是不受个人感情影响的，在霍布斯的说法里，君主的权力是由契约产生的。

耶鲁公开课 - 政治哲学导论课程节选

If you buy a house and you don't pay the mortgage, the contract says you lose the house-- you're out--you've got to pay or it goes back to the mortgage originator.

如果你抵押贷款买房,却没有还房贷,贷款合同规定,你将被取消赎回权,失去房子,所以你必须偿还贷款,否则你的原始贷款人就会收回房子

耶鲁公开课 - 金融市场课程节选