学习数学的唯一方法就是做数学。

我对超自然存在的想法，就像我对数学的想法一样产生。因此我认真对待它们。

And let's be clear: It's not enough just to limit ads for foods that aren't healthy. It's also going to be critical to increase marketing for foods that are healthy.

权力的本质不在于其力量，而在于其影响力。