Mathematics is an art, and as an artist, you have to be honest with yourself.

"A book is a gift you can open again and again."

事实上，今天的美国女性比以往任何时候都拥有更多的自由和机会。

Words are like keys. If you choose the right ones, they can open any door.

欧洲不应是一个怀旧的洲，而应是一个充满希望的洲。

Small actions, when multiplied by millions of users, can change the world.

知识是灵魂的粮食。