为了生存,他们被迫同类相食。
They were forced to practise cannibalism in order to survive.
很多朊病毒类型的疾病是由同类相食所导致的。
这个星系在60到90亿年前被银河系吞噬,这种现象被称为星系同类相食。
This galaxy was gobbled up by the Milky Way between six and nine billion years ago in an act of intergalactic cannibalism.
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