The primary rules of obligation are those that require or forbid certain actions.
主要的义务规则是那些要求或禁止某些行为的规则。
发现可能性的唯一方法就是超越它们进入不可能。
当你刚刚创造出以前不存在的东西时，世界似乎总是更明亮。
The founders of a new colony, whatever Utopia of human virtue and happiness they might originally project, have invariably recognized it among their earliest practical necessities to allot a portion of the virgin soil as a cemetery, and another portion as the site of a prison.
我有一个非常简单的想法，如何变富。第一，花得比赚得少；第二，明智地投资差额。
儿童文学有塑造思想和改变生活的力量。
水泥生产中的创新必须平衡效率与环境责任。