bond servant
  奴隸
  bond-servant, Bond serv·ant A slave; one who is bound to service without wages.
     If thy brother . . . be waxen poor, and be sold unto thee; thou shalt not compel him to serve as a bond servant: but as an hired servant.   --Lev. xxv. 39, 40.
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  bond servant
       n : someone bound to labor without wages