keep a promise;keep an appointment ;

Thanks for the invitation, but I'll have to take a rain-check on it .
你的邀请我心领了,感谢盛意改日一定 践约.
来源:词典精选例句She was under pledges to other people which had at last to be redeemed.
她跟别人还有一些约会,现在终于可以去践约了.
来源:词典精选例句
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