溯源 [ㄙㄨˋ ㄩㄢˊ; su4 yuan2]
to investigate the origin of sth
to trace a river upstream back to its source
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遡源
溯源
さくげん
そげん
noun (common) (futsuumeishi)
noun or participle which takes the aux. verb suru
returning to the origin
going back to the beginning
retracing
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