Operators shall wear safety helmets.

操作人员应戴好安全帽。

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Safety helmets must be worn on this site.

此工地必须戴安全帽。

youdao

They put on their safety helmets before starting to work.

他们在工作开始以前戴上安全帽。

youdao

Police went to the Ellesmere Port address and examined safety helmets in the garage.

BBC: North West Wales

Mrs Brooke wants a thorough review of the evidence on the safety of helmets that could support a future new law.

BBC: Annette Brooke MP wants review of cycle helmet law

China implemented its first road safety traffic law in 2004, mandating helmets for motorcyclists and seat belts for passengers in the front seat.

MSN: Party on, China! But get a driver