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。
Yet that is a necessary but not sufficient condition for its success.
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)。
The IMF suggests that a sufficient (although not necessary) condition for a global recession is any year in which world GDP per head declines.
伊拉克给我们的最后一个教训是:外部的仲裁者也许是必要条件,但不是充分条件。
The final thing Iraq teaches us is that while external arbiters may be necessary, they are not sufficient.
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