煤炭的真正价值在于我们如何负责任地开采和使用它。
奇迹并不违背自然,只是违背了我们对自然的了解。
If you borrow something, try to return it in better shape than you received it. Clean it, sharpen it, fill it up.
乐观是一种可以学习的技能。一旦你学会了它,你就能在各个方面改善你的生活。
No one is altogether to be blamed for the defects of his nature; but he is blameworthy if he takes no pains to correct them.