machine guards

例句：

1. 1. The machine guards are designed to protect the operator from harm.
   这些机器防护装置旨在保护操作员免受伤害。
2. 2.The engineers were busy installing new machine guards on the factory floor.
   工程师们忙于在工厂地板上安装新的机器防护装置。
3. 3.The workers had to wear protective gear while working with the heavy machinery.
   工人们在工作中不得不穿戴防护装备，以保护自身安全。