单词	forepump
释义	forepump noun : a vacuum pump auxiliary to a more effective pump for which it supplies a first stage of exhaustion called also backing pump Word History Etymology fore- + pump
随便看	stepsister stepsisters stepson stepsons stepstone stept steptoes stepups stepway stepwise stepwiser stepwisest ster ster broom ster chimes steradiancy steradians stercoraceous stercoral pocket stercoranism stercoranist stercoranists stercorarian stercorarii Stercorariidae

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