pumpless

形容词 adj.
中文释义

英文释义

形容词 adj.
  1. Without a pump. not-comparable
    — Between Paris and Lyons the substation rectifiers were multi-anode units with vacuum pumps, either water- or air-cooled (the pumpless type having come later into general use on the Continent than in Britain and being first used for main-line traction in France in 1953).

词源

From pump + -less.
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