- necessaryandsufficientcondition
- 充分: full; ample; abundant; suffi ...
- 必要條件: essential condition; prerequ ...
- 充分必要條件: necessary and sufficient conditions
- 充要條件: necessary and sufficient conditions; sufficient and necessary condition
- 必要條件: condicio necessaria; essential condition; indispensable condition; nece ary condition; necessary and sufficient conditions; necessary conditions; postulate; prerequisite; requirement; requisite condition; sine qua non
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