单词：sine qua non
sine qua non的用法和样例：
例句
- The second fundamental-- like the others,it must be non--is to focus on the quality of your people.第二个同样不容忽视的要素是，要重视雇员素质的培养。
经典引文
Publication is a sine qua non condition for the generation of literature.
出自：De Quincey
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