secondary source
noun /ˈsekəndri sɔːs/
  /ˈsekənderi sɔːrs/
- a book or other source of information where the writer has taken the information from some other source and not collected it himself or herself二手资料 
| 词汇 | secondary source | 
| 释义 | secondary sourcenoun /ˈsekəndri sɔːs/  /ˈsekənderi sɔːrs/ 
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