Some studies are based on skeletons found at archaeological sites; averaging their results suggests that 15 percent of prehistoric humans met a violent death at the hands of another person.

有些研究来源于考古地点发现的史前人类骨骼遗骸，平均起来看，有15%死于他人的暴力行为。

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But when one of their number dies a violent death, they soon realize that what happens in their dreams happens for real, and the only way to stay alive is to stay awake.

然而，在他们中的一个遭遇横死之后，他们很快意识到梦境中发生的一切都是真的，要保住性命，唯一的办法就是保持清醒。

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But when one of their number dies a violent death, they soon realize that what happens in their dreams happens for real, and the only way to stay alive is to stay awake.

然而，在他们中的一个遭遇横死之后，他们很快意识到梦境中发生的一切都是真的，要保住性命，唯一的办法就是保持清醒。

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