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单词 primary source
释义
primary source
The most common primary sources are written documents.
A Short Guide to Writing About History (1995)
There can be little doubt that the primary source of these evils is the academy.
Tenured Radicals: How Politics Has Corrupted Higher Education (1990)
The primary sources that she cites are the printed calendars available online.
The Times Literary Supplement (2014)
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