to sign a contract

基本解释

It said parents had to sign a contract before admission acknowledging that their child would be given ECT.
家长们必须在子女入院前签署一份合约，确认他们知道孩子会接受电击疗法。
I wanted to sign a contract for only one semester but found that most positions were for one or two years.
我只想签一个学期的合同，但发现大多数的职位是一年或二年。
After learning about ThinkTank from a neighbor, Ms. Li persuaded her husband to sign a contract for 90,000 renminbi, which focuses on nine selective U. S. schools.
在从一个邻居那儿得知有关智库教育的信息以后，李曼红夫妇同智库教育签订了一份价值9万人民币的合同，合同中选定了9所美国大学。

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

Until recently, DirecTV did not require customers to sign a contract when they bought systems.
FORBES: Stealing The Show