合同工的英文：
jobbing work
contract worker
contract labor

jobbing是什么意思：
n. 工作，零活
v. 做零工，打杂

You are not qualified for this job.
你不适合这份工作。

That is a job and a half.
那是非常困难的工作。

To assign a peripheral to a job for the duration of the job.
把一个外围设备在作业期间内指定给一个作业使用。

contract是什么意思：
n. 契约；合同；婚约
v. 感染；（使）缩小，缩短，收缩；订契约

The contract was negotiated.
合约已谈妥。

confidentiality of contracts
合同的保密性

Renewal of contract
合同的续订