That's a real fluid boundary between the divine and human realms, if you ask me. But it only happens there, in one spot.

这在神族和人类之间可真是一个不固定的界限，如果你问我的话，然而这种情况只在一个地点发生。

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And that was possible in smallpox because of a few characteristics of the disease: one is that it's a--it's purely a human disease, humans are the only organisms that are affected by it.

天花能够被根治的原因在于,这种疾病具有以下几个特点,一是,它是一种只有人类才得的疾病,人类是唯一受天花感染的生物

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And, of course, Google is moving quickly forward with road-worthy autocars that have accumulated 300, 000 miles with only one (human error) accident.

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Lakshmi, although apparently a last-second replacement for no-show Scarlett Johanssen, had the strongest ideas, or at least was the only one to propose actual human beings.

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In the far future, humans have colonized a distant planet, home to the enigmatic Ariekei, sentient beings famed for a language unique in the universe, one that only a few altered human ambassadors can speak.

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