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！