I don’t like to be comfortable. I like to push myself.
我不喜欢安逸，我喜欢挑战自己。
Every patient’s story is a lesson in medicine.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
Natural experiments can provide valuable insights into economic questions.
无限小在自然中的作用是无限大的。