erector

例句：

1. 2.
   建筑或机械
2. 3.
   在军事上
3. 1.The engineers are installing the new equipment in the factory.
   工程师们正在工厂安装新设备。
4. 2. The military leader is the commander of the troops.
   军队的指挥官是部队的统帅。
5. 3. The electrician is the installer of the new electrical system.
   电工是新电气系统的安装人员。