这台机器由多个相互连接的子单元组成。

This machine is made up of interconnected ___sub-units.

为了提高效率，学校将教研组细分为多个学科小组。

To improve efficiency, the school divided teaching groups into smaller ___sub-units by subject.

该公司被分成三个子单位来执行不同的任务。

The company was split into three ___sub-units to carry out different missions.