https://online2.tingclass.net/lesson/shi0529/0009/9907/591.mp3
https://image.tingclass.net/statics/js/2012
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。
