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

一些医学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，转向他的伴。

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

与在晴天产图像的学技术，SAR 穿透云层并在夜间工作。

How does the Chinese contractor solve the problem of working at night in a country where local workers usually work at daytime?

中国承包商如何解决当地工人通常在白天工作的国家夜间工作的问题？

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。

This act also  declared that anyone under the age of 18 was no longer allowed to work at night, and that  their employers had to give them an hour's lunch break, so some progress  was made during this time.

该法案还宣布，任何未满 18 岁的人得再在夜间工作，并且雇主必须给他们一个小时的午休时间，因此在这段时间取得了一些进展。