labor-saving
  (adj.)省力
  La·bor-sav·ing a. Saving labor; adapted to supersede or diminish the labor of men; designed to replace or conserve human and especially manual labor; as, labor-saving machinery;  labor-saving appliances4; labor-saving devices like washing machines.
  Syn: -- laborsaving.
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  laborsaving
       adj : designed to replace or conserve human and especially manual
             labor; "laborsaving devices like washing machines"
             [syn: laboursaving]