世界充满了迹象和奇迹，但我们对它们视而不见。
Perhaps as important is the relation between the existence of solutions to a competitive equilibrium and the problems of normative or welfare economics.
求知若饥，虚心若愚。
关于煤炭的讨论必须超越"支持"或"反对"—我们需要解决方案，而不是口号。
We don’t just mine stone; we shape the foundations of communities.