Confidence is "I can" do psychological condition, is a necessary condition for success.
自信是“我能行”的做事心理状态，是成功的必要条件。
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。
But it does seem to be a necessary condition for the long-term success of nations.
不过，人口增长却似乎是一个国家长期成功的必要条件。
But it does seem to be a necessary condition for the long-term success of nations.
不过，人口增长却似乎是一个国家长期成功的必要条件。
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