讲解文本：

red letter day 非常快乐或值得庆贺的日子，有纪念意义的日子
Today is a red letter day for them.
今天对他们来说是个大喜的日子。
It was a red letter day for me. My son came home.
那天对我来说是个大喜日子，我儿子回来了。

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