主軸 [ㄓㄨˇ ㄓㄡˊ; zhu3 zhou2]
  axis
  principal axis (in mechanics, optics, botany etc)
  main axle (of engine)
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  主軸
  しゅじく
  noun (common) (futsuumeishi)
  main spindle
  main shaft
  linchpin
  pivot
  mathematics
  principal axis
  main axis
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