永远不要停止学习，世界总是在变化。
Never stop learning; the world is always evolving.
On television， all subject matter must be presented as entertainment.
煤炭的真正成本不仅在于价格，还在于我们如何管理其后果。
Perhaps as important is the relation between the existence of solutions to a competitive equilibrium and the problems of normative or welfare economics.
Emancipate yourselves from mental slavery, none but ourselves can free our minds.