a difficult activity that you need to be intelligent to do or understand . This word often shows that you do not think an activity is difficult at all 费力的事，难事（该词常表示认为某事根本就不难）
Replacing a car tyre isn’ t exactly rocket science. 更换汽车轮胎并不是什么难事。
DERIVED WORD
ˈrocket ˌscientist noun C
You don’ t have to be a rocket scientist to figure that one out. 弄明白那个不需要你有多么高超的领悟力。