| 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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