Every tree we plant today is an investment in tomorrow's clean air, stable climate, and thriving ecosystems.

You have to fight to reach your dream. You have to sacrifice and work hard for it.

"We are all just walking each other home."

Simple can be harder than complex: You have to work hard to get your thinking clean to make it simple.

统计学家的目标是从样本中推断出总体是什么。

研究人员最重要的品质是坚持。