I was burning the midnight oil last night to finish my project.

我昨晚熬夜工作以完成我的项目。

She often burns the midnight oil to prepare for her exams.

她经常熬夜学习以准备考试。

If you keep burning the midnight oil, you might get sick.

如果你继续熬夜工作，可能会生病。

He burned the midnight oil to meet the deadline for submission.

他为了按时提交而熬夜工作。

They were burning the midnight oil in the library before the big test.

他们在大考前在图书馆熬夜。