gas helmet

基本解释

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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Purchased key Labor Protection Articles, such as Safety Helmet, Anti-gas Aspirators must have label of safety assessment.
所采购的关键劳动防护用品如安全帽、防毒口罩等必须有安鉴字样的标签。
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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。

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