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We use this air horn to give a signal in the event of emergency.
应急情况下，用这个气喇叭发信号。
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Rotational fan: Horn-shape fan concentrates the air flow.
转动风扇：喇叭型风机集中的空气流通。
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Rotational fan: Horn-shape fan concentrates the air flow.
转动风扇：喇叭型风机集中的空气流通。
youdao