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遡〔溯〕 {sù}

  1. to go upstream
  2. to trace the source

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溯 sou3 {sù}

  1. to go upstream
  2. to trace the source

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溯源 sou3 jyun4 {sù yuán}

  1. to investigate the origin of sth
  2. to trace a river upstream back to its source

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