Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.

可持续性不是一种趋势，而是乳制品农业的未来。

除了诱惑，我什么都能抵抗。

You don't have to have the ability that quantum mechanics requires.You just have to know a few simple things and really know them.