I'm not a permanent employee; I'm working here on a fixed-term contract.
我并不是永久雇员,而是根据定期合同在此工作的。
Marriage is, first of all, a contract which must be governed by justice.
婚姻首先是一种契约,它必须以公正为制约。
The city contracted for a library with their firm.
市政当局和他们公司订立了修建图书馆的合同。