The rate of species extinction is accelerating to dangerous levels.

物种灭绝的速度不断加快，已经敲响了警钟。

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But the rate of extinction is far from constant.

但是灭绝的速度同一个恒定的常数有着相当大的距离。

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But the rate of extinction is far from constant.

但是灭绝的速度同一个恒定的常数有着相当大的距离。

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