They sent us a letter to explain the delay.
他们给我们一封信解释为什么耽搁了。
She sent him letter after letter to explain the delay.
她给他写了一封又一封信,向他解释推迟的原因。
You're a liar. You said, "I'll email you by Wednesday" – and you didn't get in touch until Friday, not even to explain the delay.
你善于说谎。你说:“我周三会给你发邮件。”但直到周五才会与人联系,甚至连一个解释都没有。
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