遊牧 [ㄧㄡˊ ㄇㄨˋ; you2 mu4]
  nomadic
  to move about in search of pasture
  to rove around as a nomad
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  遊牧
  ゆうぼく
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  nouns which may take the genitive case particle `no'
  nomadism
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