Must wear safety helmet 必须戴安全帽 ; 中国国家标准标识
Operator should wear safety helmet when at work.
工作时操作手应戴安全帽。
All visitors to the site must wear safety helmet.
到工地的所有参观者必须带上安全帽。
During the dismantle, the operation staff in the high altitude should wear safety helmet and safety belt, and the ground staff should wear safety helmet.
在装卸过程中，高空作业的操纵人员应配戴安全帽与安全带，在地面作业人员应戴安全帽。
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