单词	sine qua non
释义	sine qua nonsi‧ne qua non /ˌsɪni kwɑː ˈnəʊn $ -ˈnɑːn/ noun [singular] formal Word Origin WORD ORIGINsine qua non Origin: 1600-1700 Late Latin ‘without which not’ something that you must have, or which must exist, before something else can happen SYN  prerequisitesine qua non for/of The control of inflation is a sine qua non for economic stability.
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