潛水 [ㄑㄧㄢˊ ㄕㄨㄟˇ; qian2 shui3]
  to dive
  to go under water
  lurker (Internet slang for sb who reads forum posts but never replies)
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  潜水
  せんすい
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  diving
  submerging
  going underwater
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