Protective helmets must be worn on site.

在工地现场必须带防护帽。

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That's why polystyrene is ideal for use in bicycle helmets and other protective gear.

这也是为什么聚苯乙烯是制作自行车头盔以及其他保护装置的理想材料的原因。

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Hovding is a protective collar designed for people that hate wearing helmets.

Hovding （官方网址）是一种高翻领样式的衣领，专门为不喜欢戴头盔的人设计。

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After the city's car culture created a smog problem, scientists started researching protective helmets to protect people.

CNN: China needs smog-free air in a can

For those who want to fully embrace their inner Ducatista, there is a range of accessories, from the standard protective jackets, helmets and gloves, to bags, watches and even a sharp-looking Cigarette-branded model boat.

WSJ: At the Heart of Ducati

Police, dressed in helmets and protective clothing, smashed their way into Mr Ahmad's home just after 0500.

BBC: Police officers 'attacked' terror suspect Babar Ahmad