梦想是免费的,但奋斗需要付出代价。
煤炭不是问题所在,问题在于我们如何使用它。解决方案在于更清洁的技术和更好的利用。
You have to be willing to fail, to be wrong, to keep trying.
Pleasures, then, and the avoidance of pains, are the ends that the legislator has in view.