一项对全球野生动物的大规模年度调查表明，近四分之一的陆地哺乳动物物种濒临灭绝，还有许多其余的物种，甚至在科学界知道它们之前可能就已经绝迹了。

Nearly a quarter of the world's land mammal species are at risk of extinction, and many others may vanish before they are even known to science, according to a major annual survey of global wildlife.

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