Fearless is not the absence of fear. It's not being completely unafraid. Fearless is having fears. Fearless is having doubts. Lots of them. Fearless is living in spite of those things, every day.

疼痛不仅仅是一种感觉；它是一种复杂的生物反应，告诉我们某些地方出了问题。

科学是理解世界，而工程是改变世界。

人生就像一场逆行的旅程，我也是一个匆匆的过客。