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。
Says Kirk: "Failure early on is a necessary condition for success, though not a sufficient one."
柯克对《福布斯》杂志表示：“早期的失败虽然不是成功的充分条件，但却是一个必要条件。”
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。
'Passion is a necessary but not sufficient condition for success in the workplace,' says James Elsen, President and chief executive officer of SustainableCircles Corp.
的总裁兼首席执行长詹姆斯•爱尔森(James Elsen)表示，要想取得事业上的成功，热爱是必要条件，但并非充分条件。
So forced to choose one over the other, I would hazard that ability outweighs persistence because persistence is only a sufficient condition for success; ability is both necessary and sufficient.
所以若一定要选择哪个对成功更重要的话，我选能力，坚持仅仅是成功的充分条件，而能力则是充分必要条件。
So forced to choose one over the other, I would hazard that ability outweighs persistence because persistence is only a sufficient condition for success; ability is both necessary and sufficient.
所以若一定要选择哪个对成功更重要的话，我选能力，坚持仅仅是成功的充分条件，而能力则是充分必要条件。
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