Taivo A Taiwan Mandarin dictionary

逆流溯源

nìliúsùyuán

ㄋㄧˋ ㄌㄧㄡˊ ㄙㄨˋ ㄩㄢˊ

  1. 1to go back to the source

Keep 逆流溯源 and it comes back until you know it.

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