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keep one's word<-->knock at
keep up 保持; 维持; 继续 There's every reason to keep up your self-confidence. 有充分理由保持你的自信心。 The least we can do is try to keep up appearances. 我们至少可以努力保持形象。 They promised each other they would keep up their friendship forever. 他们相互允诺要永远保持他们之间的友谊。 I was so hungry all the time that I could not keep the diet up for longer than a month. 我无时无刻都觉得饿,节食坚持不到一个月就放弃了。 They risk losing their homes because they can no longer keep up the repayments. 因为无力继续偿还借款,他们面临无家可归的危险。
keep one's word<-->knock at
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