The helmet is made of a small, helium gas cylinder with special motion sensors.

头盔由带特殊的运动传感器的小氦气筒组成。

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The helmet crew is a professional team for treating the disaster accidents such as the mine fire, mine gas, mine dust, mine water, and roof, etc.

矿山救护队是处理矿井火、瓦斯、煤尘、水、顶扳等灾害事故的专业队伍。

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All the competitors must supply their own safety equipment and must wear a helmet. Gas and electric powered bikes are not permitted.

参赛者自备参赛车辆、装备与护具，所有车辆不得配有任何非人力传动、助动装置。

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The device looks a bit like a massively overgrown telephone headset, with overtones of a cycle helmet and maybe a gas mask thrown in.

BBC: Motorola unveils a computer that straps onto your head

Oviatt testified Monday that within minutes of the first calls, he responded to the theater and found Holmes standing outside in a helmet and gas mask, his hands atop a white coupe that turned out to belong to him.

CNN: STORY HIGHLIGHTS

Then he donned a police-style helmet and body armor, tossed a gas canister into the theater crowd and opened fire, prosecutors said.

NPR: Colo. Judge Enters Not Guilty Plea For Holmes