这台机器由几个相互连接的子单元组成。

This machine is made up of several interconnected ___subunits.

该公司被分成五个子单位来执行不同的任务。

The company was divided into five ___subunits to carry out different tasks.

这栋公寓楼的每个小单元都有自己的独立入口。

Each ___subunit in this apartment building has its own private entrance.