1·When do you wear a safety helmet?
你什么时候要载安全帽？
2·Wear your safety helmet when you go down.
我有时候骑机车没有戴安全帽。
3·Which is the best kind of safety helmet to buy?
我们买那种头盔是最好的？
4·Operator should wear safety helmet when at work.
工作时操作手应戴安全帽。
5·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。
6·The safety helmet is held on by an elastic strap.
安全帽用一根松紧带系住。
7·Wear your safety helmet and ear protection at all times.
任何时候都戴好你的安全头盔和听力保护装置。
8·We need safety helmet in spelunking, how could we get it?
洞穴探险需要安全帽？我们哪来的安全帽呀？
9·Wearing a safety helmet, sweating is better than bleeding.
骑车请戴安全帽，流汗总比流血好。
10·This way please. Do not forget to put on your safety helmet.
请从这边走。别忘了戴好安全帽。