https://online2.tingclass.net/lesson/shi0529/0009/9907/285.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
twenty-four seven 一天到晚，每时每刻，也写作24/7
The supermarket is open twenty-four seven, so I can buy whatever I need whenever I want.
这家超市全年无休，所以我可以在任何时间买到我想要的东西。
They are still working twenty-four seven!
他们还是没日没夜的工作。
疯狂练习吧!
