Night work has even been classified by some medical groups as a risk factor for many cancers.

一些医团体甚至将夜间工作列为许多癌症的危险因素。

" He wanted to know about some night work, " he explained, turning to his companions.

“他想知道一些夜间工作， ” 他解释说，向他的同伴。

Unlike optical technology which produces the best images on sunny days, SAR penetrates clouds and works at night.

与在晴天产生最佳图像的光技术不同，SAR 可穿透云层并在夜间工作。

The Unquenchables had done their best to be worthy of the name, for like elves they had worked by night and conjured up a comical surprise.

Unquenchables 已尽最大努力配得上这个名字，因为他们像精灵一样在夜间工作，并创造了一个滑稽的惊喜。