translation.en: At the worst extreme, many traditional societies get rid of their elderly in one of four increasingly direct ways: by neglecting their elderly and not feeding or cleaning them until they die, or by abandoning them when the group moves, or by encouraging older people to commit suicide, or by killing older people.
translation.zh: 在最坏的极端，许多传统社会 通过以下四种一种比一种残忍的方式 来处理部落中的老年人： 第一种做法是忽略他们 不给他们吃的， 不打理他们，任其自生自灭， 第二种做法是在整个群体迁移时，抛弃他们， 第三种做法是迫使老人自杀， 最后， 最残忍的， 杀死老人。