The disposable coffee cup lid falls squarely in the category of random, everyday objects that you might assume are overlooked, but are actually quite the opposite.
你可能觉得这些一次性的咖啡杯盖子和其他日常用品没什么特别的，其实这些盖子中大有玄机。
2
The investigation cost and crime cost are a pair of category of unification and opposite, and their relationship influences the investigation benefit directly.
侦查成本与犯罪成本是对立统一的范畴，二者之间的关系对侦查效益有着直接的影响。
3
The unit crime is one category which is opposite to the crime of natural person.