为了生存，他们被迫同类相食。
They were forced to practise cannibalism in order to survive.
中国历代反复出现的人相食现象就是这一悲惨世界的证据。
Proof of this misery is the cannibalism that recurs in China's history.
在原始社会里，即使是同类相食的人类，也会令一种大脑疾病遗传下去。
Even human cannibals in primitive societies have a problem with a brain disease passed in this way.
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