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.
翻译：干旱陆地的野生动物的最关键的问题是能够不受妨碍地(获得)水。
The most crucial issue for wildlife in this arid land is unimpeded ________ water.
翻译：干旱陆地的野生动物的最关键的问题是能够不受妨碍地(获得)水。
The most crucial issue for wildlife in this arid land is unimpeded ________ water.
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