Don't wait for permission to make a difference.

事实上，今天的美国女性比历史上任何时候都拥有更多的权力和影响力。

Man's main task in life is to give birth to himself, to become what he potentially is. The most important product of his effort is his own personality.

数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。