铁蛋儿的问题，不是他不识字，也不是他不会思考，而是他不知道什么是思考，并且将其与感觉相混淆。
The problem isn't that Johnny can't read. The problem isn't even that Johnny can't think. The problem is that Johnny doesn't know what thinking is; he confuses it with feeling.
Innovation in mining isn't optional—it's survival.
Sometimes the thing you're most afraid of doing is the very thing that will set you free.
可持续性不是一种选择，而是我们对后代的责任。