没有“悲哀”提供平衡，“愉快”一词就会失去意义。
The writer must be a defender of the individual against the collective.
The concept of NP-completeness has provided a powerful tool for understanding the complexity of problems.
我们做产品不是为了炫技，而是要解决实际问题。
译文：因此，即使拥有中原的富饶，也比不上这座都城的无限繁华。
任正非在一次董事会上说
The construction industry must evolve or risk becoming obsolete.