这可能看似《人体入侵者》（又名《天外魔花》）里的情节，不过，现在他们当我们是抢手货，而不是相反。
It may seem like Invasion of the Body Snatchers, but they're snatching us, not the other way around.
人体发现一个危险病原体时，部分免疫系统就会有所反应，并能抵抗入侵者，即使免疫系统之前从未遇到过类似的病原体。
When it sees a dangerous pathogen, part of the immune system is adaptive and can resist the invader even if it has never seen the agent before.
Levy表示人体可能会认为鳄鱼蛋白质是外来入侵者而拒绝他们。
Levy said the human body might reject alligator proteins, thinking they're foreign invaders.
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