研磨 [ㄧㄢˊ ㄇㄛˊ; yan2 mo2]
  milling
  to grind
  to polish by grinding
  to abrade
  whetstone
  pestle
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  研磨
  研摩
  word containing irregular kanji usage
  けんま
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  nouns which may take the genitive case particle `no'
  grinding
  polishing
  studying
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