我们不能忽视煤炭的经济作用,但也不能忽视其环境影响。
Challenges are what make business interesting; overcoming them is what makes it rewarding.
无政府状态是战争的允许性原因;它创造了一个国家必须依靠自助来确保生存的环境。
To feel much for others and little for ourselves; to restrain our selfishness and exercise our benevolent affections, constitute the perfection of human nature.