clone /ˈklon/
  無性系
  clone /ˈklon/ 名詞
  克隆,無性繁殖系,無性系
  clone
       n 1: a person who is almost identical to another [syn: ringer,
            dead ringer]
       2: a group of genetically identical cells or organisms derived
          from a single cell or individual by some kind of asexual
          reproduction [syn: clon]
       3: an unauthorized copy or imitation [syn: knockoff]
       v : make multiple identical copies of; "people can clone a sheep
           nowadays"