历史学家必须怀有一种信念：人类不会也不能灭亡。
The historian must have a kind of faith that humanity will not and cannot perish.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
Life is an adventure, it’s not a package tour.
气候变化不是未来的威胁，它正在改变我们今天的田地。