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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也许表观基因变异会因DNA突变而得到强化，且由此变得稳定并以常规方式遗传下去。

It may be that epigenetic changes could be reinforced by mutations in the DNA, making them stable and heritable in the conventional way.

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但这些变化并不像成功的基因突变一样，能够永久地遗传下去，实际上它们往往在一两代的时间里就会消失。

But those changes are not passed on indefinitely, like a successful genetic mutation would be. Instead, they are wiped out over a generation or two.

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