air pump
排氣唧筒,抽氣機
Air pump
1. Physics A kind of pump for exhausting air from a vessel or closed space; also, a pump to condense air or force it into a closed space.
2. Steam Engines A pump used to exhaust from a condenser the condensed steam, the water used for condensing, and any commingled air.
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air pump
n : a pump that moves air in or out of something [syn: vacuum
pump]