而随着人口增长，越来越多的动物植物将走向灭绝，一个物种的第二家园，也许将是它们唯一的家园。

And as the human population increases, driving more animals and plants toward extinction, a species' second home may be the only one it has.

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那时估计这个死亡数字会随着人口增长和婴儿潮那代人变老而大幅提高。

That toll was expected to rise sharply as population grew and baby boomers aged.

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