A testing problem or situation is very difficult to deal with and shows a lot about the character of the person who is dealing with it.
The most testing time is undoubtedly in the early months of your return to work.
最考验人的时候无疑是在你重返工作岗位的头几个月。
Testing is the activity of testing something or someone in order to find out information.
product testing and labelling.
产品的检测与标记。