The workers on the construction site should put on their safety helmets before starting to work.
建筑工地上的工人在开始工作以前都必须戴上安全帽。
Operators shall wear safety helmets.
操作人员应戴好安全帽。
It is much safer for the children to wear safety helmets when biking.
在骑自行车时戴上安全帽对于孩子会更安全。
They put on their safety helmets before starting to work.
他们在工作开始以前戴上安全帽。
Safety helmets must be worn on this site.
此工地必须戴安全帽。
Safety helmets must be worn on this site.
此工地必须戴安全帽。
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