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.
描述自然景色，也暗喻人应顺应自然。
Be strict with yourself and forgiving of others. The reverse is hell for everyone.
The ultimate goal of AI is to serve human society and improve people's lives.