| 单词 | sine qua non |
| 释义 | sine qua nonBrE /ˌsɪneɪ kwɑː ˈnəʊn/ NAmE /ˌsɪneɪ kwɑː ˈnoʊn/ noun [sing. ]~ (of /for sth )(from Latin , formal ) something that is essential before you can achieve sth else 必要条件 |
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