当我看着这个世界时,我是悲观的,但当我看着人们时,我是乐观的。
It is India that gave us the ingenious method of expressing all numbers by means of ten symbols, each symbol receiving a value of position as well as an absolute value.
解决复杂问题的关键通常是找到正确的抽象,这种抽象可以在不丢失问题本质特征的情况下简化问题。
Civilization as it is known today could not have evolved, nor can it survive, without an adequate food supply.