If we want clean air and water, we must start by protecting our forests.
如果我们想要清洁的空气和水，就必须从保护森林开始。
The most important thing in directing is to have a clear vision of what you want to achieve.
The arithmetic of L-functions is a key to unlocking the secrets of number theory.
With each advancement in ultrafast lasers, we rewrite the textbook on how atoms and molecules behave.
A smooth sea never made a skilled sailor.
如果你不能嘲笑自己，你就错过了最好的笑话。