cow·herd /-ˌhɝd/
  放牛的,牧牛者
  Cow·herd n.  One whose occupation is to tend cows.
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  cowherd
       n : a hired hand who tends cattle and performs other duties on
           horseback [syn: cowboy, cowpuncher, puncher, cowman,
            cattleman, cowpoke, cowhand]