necessary and sufficient condition [数] 充要条件 ; 充分必要条件 ; 必要且充分的条件 ; 必要条件
sufficient and necessary condition [数] 充分必要条件
necessary-sufficient condition 必要
necessary-sufficient condition match 必要
necessary or sufficient condition 充分或必要条件
necessary an sufficient condition 充分必要条件
necessary condition and sufficient condition 必要条件和充分条件
Yet that is a necessary but not sufficient condition for its success.
然而，对于它的成功来说，这是一个必要条件，但不是充分条件。
The IMF suggests that a sufficient (although not necessary) condition for a global recession is any year in which world GDP per head declines.
IMF认为世界年度人均GDP下降是全球经济衰退的一个充分条件（而不是必要条件）。
Powerful chemical agents are a necessary but not sufficient condition for a chemical warfare capability.
高效的化学毒剂满足化学战的必要而非充分条件。
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