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The pump exhaust should lead to the open air or a fume hood.
抽气泵的排气管应该导向室外空旷处或导向一座通风橱。
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An air extraction hood must be switched on during operation of the gas cooktop.
一个抽气罩必须开启燃气灶具期间的操作。
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An air extraction hood must be switched on during operation of the gas cooktop.
一个抽气罩必须开启燃气灶具期间的操作。
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