When you make a pledge, you should always try to fulfil it.

你许下了诺言, 就必须始终努力去兑现它.

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Let us make a pledge to meet in September.

让我们立个誓:九月再相见.

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You must make a pledge to keep the secret.

你必须发誓保密.

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I make a pledge with my personality.

我以我的人格起誓.

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