Good presenters know that the content (data, evidence, logic) is a necessary condition but not a sufficient condition for a truly world class presentation job.

优秀的讲演者知道，内容(数据、证据、逻辑)只是真正的世界级讲演的必要条件，而非充分条件。

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Similarly, if we hear that self-expression_r is a sufficient condition of art, that prompts us to ask whether or not that criterion really picks out only artworks.

与此相似，如果我们听说自我表现是艺术的一个充分条件，那就立刻促使我们问：这个标准是否真的能够单把艺术甄别出来。

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However, it is not hard to show that every one of these attributes is at best a necessary condition but not a sufficient condition for a thing to be art.

然而，不难表明，这些属性中的每一种，对于一个东西成为艺术而言，充其量是一个必要条件，而非一个充分条件。

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But it is a sufficient condition: it happening will lead to a contracting economy.

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Money is a necessary but not a sufficient condition for the good life, for happiness and wisdom.

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Foote et.al (2009) argue that negative equity is merely a necessary but not a sufficient condition for default.

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