总承包商雇佣了一家分包商来负责大楼的管道工程。

The general contractor hired a ___subcontractor to take care of the plumbing work in the building.

我们雇佣了一家外部公司作为分包商来安装新办公室的电路系统。

We hired an external company as a ___subcontractor to install the electrical systems in our new office.