multiple vane pump复式: compound; multiple; double叶轮泵: vane pump闭式叶轮泵: pumwith enclosed impellers; pumwith external bearing; umwith enclosed impellers开式叶轮泵: open impeller pump; open-impeller pump竖式叶轮泵: vertical turbine pump下载手机词典可随时随地查词查翻译