primary source

ˌprimary ˈsource noun [countableC]

a document, book etc that contains information that has been obtained from people’s experiences and not taken from other documents, books etc 〔通过实验、访谈等获得的〕第一手材料，直接资料 → secondary source

Examples from the Corpus

primary source• Tobacco has collapsed as a primary source of funds.• Playing basketball has never been his primary source of income.• The research involves the use of primary source materials in national and local archives.• For these reasons it is often difficult in many cases to trace a single primary source.• The radio is the primary source of information and link to the outside world.• Moreover, they saw their primary source of leverage-financial rewards-as less effective with the big producer.

单词	primary source
释义	primary source ˌprimary ˈsource noun [countableC] a document, book etc that contains information that has been obtained from people’s experiences and not taken from other documents, books etc 〔通过实验、访谈等获得的〕第一手材料，直接资料 → secondary source Examples from the Corpus primary source• Tobacco has collapsed as a primary source of funds.• Playing basketball has never been his primary source of income.• The research involves the use of primary source materials in national and local archives.• For these reasons it is often difficult in many cases to trace a single primary source.• The radio is the primary source of information and link to the outside world.• Moreover, they saw their primary source of leverage-financial rewards-as less effective with the big producer.
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