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

I will not sign that contract!

我不会签那个合同的！

I will 课堂 - SpeakingMax英语口语达人

One team offered him a thirty thousand dollar gift just to sign a contract agreement.

VOA: special.2010.04.11

They said, would you sign a contract that if you had this loss the contract would pay you a certain amount of money?

他们是这样说的，你会签署一个合约,上面约定了，当你发生损失,你会得到合约中约定的赔偿金？

耶鲁公开课 - 金融市场课程节选

"But,it is this television that does not want to sign a contract with the Union and does not want to pay royalties.

VOA: standard.2009.08.27

It's illegal to sign an agreement, to sign a contract saying you're going to restrict quantities.

签订这样限制产量的协议,属于违法行为

耶鲁公开课 - 博弈论课程节选

The court has also ordered Walfadjri to sign a "general representation" contract with the Office for Artists' Royalties.

VOA: standard.2009.08.27

And so if you sign a contract with the government for millions of dollars, you have guarantee to get your dollars back, plus whatever profits they allowed in the contract.

所有如果你和政府签订了合约,做了一个百万的大单子，你能保证拿到钱，和其他的利润,在合同里规定的利润。

斯坦福公开课 - 经济学课程节选

Right. You didn't sign the social contract. I didn't sign it.

对，你并没有签社会契约，我也没有。

耶鲁公开课 - 公正课程节选