需要戴安全帽的

例句：

1. 1. The construction worker must wear a safety helmet when working on the roof.
   这位建筑工人在屋顶工作时必须戴安全帽。
2. 2.The driver was required to wear a safety cap while driving in heavy rain.
   司机在大雨中驾驶时被要求戴安全帽。
3. 3. The factory requires all employees to wear safety helmets when using power tools.
   工厂要求所有员工在使用电动工具时都佩戴安全帽。