失败是犯了错误，但不能兑现的经验。
Failure eis made a mistake, but fail to live up to experience.
如果增加援助的承诺不能兑现，这将是一大悲剧性错误。
It would be a tragic mistake if the promises of increased aid were not delivered.
我们所担心的是他们不能兑现他们的承诺。
What we are worried about is that they won't keep their word.
我们所担心的是他们不能兑现他们的承诺。
What we are worried about is that they won't keep their word.
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