"In observational studies, we often have to rely on assumptions that are not directly testable."

推动的关键在于让正确的选择变得容易。

We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.

Teachers are the most important role models in schools, the most instructive examples, and the most vivid examples for students.

每位艺术家都将画笔浸入自己的灵魂，将自己的本性绘入画作。

"I wonder how many people I've looked at all my life and never seen."