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词汇 防毒面具
例句 They had started to issue gas masks and prepare air-raid shelters.他们已经开始发放防毒面具,并准备防空洞。The firefighters wore respirators to help them breathe in the smoke-filled house.消防员戴上防毒面具以便能在烟雾弥漫的房中呼吸。
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