煤炭的真正价值在于我们如何负责任地开采和使用它。
There is no man, however wise, who has not at some period of his youth said things, or lived in a way the consciousness of which is so unpleasant to him in later life that he would gladly, if he could, expunge it from his memory.
一本书之所以成为一本“好书”,主要是因为我们在对的时候读了它。