Operators shall wear safety helmets.
操作人员应戴好安全帽。
Safety helmets must be worn on this site.
此工地必须戴安全帽。
They put on their safety helmets before starting to work.
他们在工作开始以前戴上安全帽。
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。
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。
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