溯源 sùyuán investigate origin Origin Definitions Defs Strokes Stroke Words Sentences Sents 追根溯源 zhuīgēnsùyuán investigate root to get to the bottom of a situation or find its fundamental cause追本溯源 zhuīběnsùyuán trace back to trace something back to its origin推本溯源 tuīběnsùyuán trace back to go back to the source逆流溯源 nìliúsùyuán trace back to go back to the source