LEARNit Dictionary
primary source
noun
/ˈpraɪməri sɔːs/
UK
/ˈpraɪmeri sɔːrs/
US
1
a document, etc. that contains information obtained by research or by observing somebody/something carefully, not taken from other books, etc.
منبع اولیه, منبع دست اول
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secondary source