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Such assistance was essential in identifying potential dangers—poisonous species, unpredictable rivers, uncharted territories—which could mean the difference between life and death.

这种援助对于查明潜在危险——有毒物种、不可预测的河流、未知领域——至关重要，那些危险可能意味着生死之差。

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That means scientists have cataloged less than 15 percent of species now alive-and current extinction rates mean many unknown organisms will wink out of existence before they can be recorded.

亦即是，在存活的物种中，只有不足15%的物种已被科学家编目，而如今的物种灭绝率意味着很多未知的生物在它们能被记录下来之前就将不复存在了。

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The discovery of such a large gibbon population may mean the species has a better chance of long-term survival, the scientists say.

科学家表示，发现数量如此之多的长臂猿意味着这个种群有更好的机会长时间存活。