科学美国人60秒:无脊椎动物现状-托福听力下载

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　　科学美国人60秒中英文翻译：无脊椎动物现状

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　　Based on the sheer number of ants that have invaded my home this summer, it seems hard to believe.

　　But a new study finds that the number of invertebrates—which include any animal without a spine—has fallen by nearly half over the past 35 years—the same period of time in which the human population has doubled.

　　The estimate appears in the journalScience.

　　When we think of extinction, we usually picture large, charismatic creatures, like the saber-toothed tiger, the wooly mammoth or the even the dodo bird.

　　Over the past 500 years, more than 300 species of vertebrates like these have disappeared.

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　　But what about critters that fly…or crawl…under our radar?

　　Butterflies, beetles, spiders, slugs and worms are all in the midst of decline.

　　Much of that die-off is due to habitat loss.

　　In the U.K., for example, scientists have recorded a 30 to 60 percent decrease in areas inhabited by common insects, including bees and wasps.

　　While fewer flying pests might seem a plus, insects also perform functions that are key to human survival, like pollinating crops and recycling nutrients.

　　So crowding out our invertebrate allies could turn out to be a real buzzkill.

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