gas helmet
英
美
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Noun:
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a protective mask with a filter; protects the face and lungs against poisonous gases
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用作名词 (n.)
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They contrived a mask against poison gas.
他们设计了一种防毒面具。
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Rioters donned handkerchiefs as gas masks.
暴乱者扎上手帕捂住口鼻作为防毒面具。
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海词词典,十七年品牌