The essence of computational complexity is to understand the limits of what can be computed efficiently.
计算复杂性的本质是理解什么可以被有效地计算的极限。
我在你们这个年龄,最害怕的不是贫穷,而是失败。
There are dark shadows on the earth, but its lights are stronger in the contrast.
The existence of a legal system depends on the acceptance of secondary rules by officials.
3.当我看到浪费一杯水的人时,我就会想到地球上那些连水都喝不上的人。
Every tree planted today is an investment in tomorrow’s world.