| 单词 | sine qua non |
| 释义 | sine qua non /suy"nee kway non", kwah, sin"ay/; Lat. /si"ne kwah nohn"/ an indispensable condition, element, or factor; something essential: Her presence was the sine qua non of every social event. [ < LL sine qua (causa) non without which (thing) not] |
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