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noun
🔊/ˈpraɪməri sɔːs/
🔊/ˈpraɪmeri sɔːrs/
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  1. a document, etc. that contains information obtained by research or by observing somebody/something carefully, not taken from other books, etc. 第一手资料；（通过研究或观察等获得的）直接材料compare secondary source