The main unit from another side.

另一边的主发电机组。

This is what we have under the main unit.

这是主机组下面的部分。

A brief description of steps is contained in the main unit.

步骤简要说明包含在主单元。

The main unit is the building of the Office of Hubei Province.

公司的主营单位是湖北省建设厅。

Safety airbag is the main unit of automotive passive safety system.

安全气囊是汽车被动安全系统的主要装置。