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。
The most sustainable farms are those that think generations ahead.
可持续性必须有利可图,否则它就无法持续。
Understanding the limits of computation is as important as pushing its boundaries.