To trace the stream back to its source; to get to the bottom of something; to investigate the origin and development of an event or issue.
为了深入了解这项传统工艺的演变，研究团队决定溯流追源，从最古老的文献开始查阅
To gain a deep understanding of the evolution of this traditional craft, the research team decided to trace it back to its source, starting with the oldest documents.
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