His obsession with success makes him work day and night.

他对成功的执念让他夜以继日地工作。

They work day and night to finish the construction project.

他们白天黑夜地工作以完成建筑工程。

Medical staff work day and night to treat and cure patients.

医护人员日夜不停地救治病人。

The hostess kept her maid at work day and night.

女主人迫使女仆日夜工作。

We must work day and night to finish this order.

我们要完成这张订单须日夜不停的工作。

Deligence means unremitting work, but not trying one's hard to work day and night without stop.

勤奋意味着坚持不懈地工作，但他并不意味着日夜竭尽全力而无休止的工作。（难）

In the old society, the landlord made the farmers work day and night.

旧社会地主让农民不分白天黑夜的干活。

The boss makes the sales assistant work day and night, It makes him angry.

老板使售货员整天工作，这使得他很生气。

The boss makes the sales assistant work day and night , It makes him angry .

老板使售货员整天工作，这使得他很生气。

Even if we have to work day and night, our daughter is going to that college.

即使我们需要不分昼夜地工作, 我们的女儿也要去上那所大学.