"The artist's duty is to reveal the invisible through the visible."

The world needs reliable energy, and coal still plays a critical role in providing it.

人为某样东西实际支付的成本至少是标价的两倍，因为买来后设置、学习、维护、修理，以及最后处置，也需要耗费精力、时间和钱。不是所有的实际成本都在价签上。实际成本是标价的2倍。

"A book is a mirror: if an ape looks into it, an apostle is hardly likely to look out."