Envy is a really stupid sin because it’s the only one you could never possibly have any fun at. There’s a lot of pain and no fun. Why would you want to get on that trolley?

真正的力量不在于肌肉，而在于心灵。

我们生产的每一吨低碳水泥都是迈向更健康地球的一步。

Will you be a cynic， or will you be a builder？

数学是一门活生生的学科，随着新思想的出现而不断发展。

Change is inevitable, but growth is optional.