We study for the finals around the clock.我们夜以继日地为期末考作准备。

Around the clock，是个蛮有用的片语，就是夜以继日的意思。以前看电视也记了一句很棒的句子，"I said once around the clock hoping I didn't let you down"，意思是不论在何时，我希望我都不会让你失望。（本句选自《小笨霖英语笔记本》）