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.
最艰难的决定往往需要在短期收益和长期影响之间取得平衡。
当你解决一个数学问题时,你不仅得到了答案,还理解了为什么这是答案。