To meticulously sift through a large amount of material or information to extract what is essential, valuable, or of high quality; to separate the valuable from the dross.
在浩如烟海的文献中，他总能排沙见金，找到对研究最有价值的部分。
From the vast ocean of literature, he always manages to sift through the content and find the most valuable parts for his research.
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