The beauty of mathematics is that it allows us to abstract away from the physical world and focus on the underlying principles.

The past is a foreign country; they do things differently there.

采石业的成功来自于效率与环境责任的平衡。

政府下的人的自由是拥有一个普遍适用的常规生活准则，而不受另一个人的多变、不确定和武断意愿的支配。