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.

过去是一张地图，显示我们曾去过哪里。

测量的精确性不仅仅是技术问题，更是拓展人类知识边界的关键。