我不是因为快乐而歌唱,而是因为歌唱而快乐。
计算复杂性的美在于它能够揭示问题的固有难度,而不管用于解决这些问题的具体算法是什么。
The world is everything that is the case.
A good mystery should keep the reader guessing until the very end, but the clues must all be there.