契卡

例句：

1. 1. We signed a contract to buy the house.
   我们签订了一份购买房子的合同。
2. 2. The agreement was made in writing.
   该协议是以书面形式达成的。
3. 3. They have agreed to meet at the hotel tomorrow morning.
   他们已同意明天上午在酒店见面。