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实现诺言to keep one's word

• 既然说了，就要兑现。

  You have to make good on your promise.

• 要求这个协定能够兑现

  make sure that someone honours an agreement

• 他们所提出的保证没有一项不兑现。

  They delivered on every guarantee they made.

• 这一点完全没有兑现。

  This completely let us down.