The concept of computational complexity is not just about how fast we can compute, but also about understanding the limits of what can be computed.

没有道德或不道德的书，只有写得好或写得差的书。

The soft drink industry thrives on constant reinvention.

The past is a foreign country; they do things differently there.

傍晚是一天中光线最美的时候，但也是光线开始消逝的时候。