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(单词翻译)
This is Scientific American's 60-Second Science. I'm Adam Hinterthuer. Got a minute?
If you're worried about news reports of West Nile virus, you might want to go take a census1 of the birds in your backyard. Because certain species of birds actually help the virus thrive. And they're not exactly exotic jungle fowl2. In fact, they’re our more familiar feathered friends.
Work on Lyme disease has shown how fragmented forests common around cities and towns are home to lots of white-footed mice, which carry that disease. Inspired by this look into the ecology of disease, researchers at Washington University turned their attention to West Nile virus. They analyzed3 mosquitoes around the St. Louis area and found that rural plots with robust4 populations of numerous bird species harbored fewer infected mosquitoes than more "citified" settings.
The typical urban or suburban5 backyard usually only holds a handful of bird species, like crows, grackles, house finches and robins6. And those birds are rich reservoirs for West Nile virus. Which ups the odds7 that a mosquito stalking a suburbanite8 may have recently fed on a bird carrying the virus. It's another example of how human activities alter the environment in unexpected ways that can often come back to bite us.
Thanks for the minute for Scientific American's 60-Second Science. I'm Adam Hinterthue
1 census | |
n.(官方的)人口调查,人口普查 | |
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2 fowl | |
n.家禽,鸡,禽肉 | |
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3 analyzed | |
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析 | |
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4 robust | |
adj.强壮的,强健的,粗野的,需要体力的,浓的 | |
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5 suburban | |
adj.城郊的,在郊区的 | |
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6 robins | |
n.知更鸟,鸫( robin的名词复数 );(签名者不分先后,以避免受责的)圆形签名抗议书(或请愿书) | |
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7 odds | |
n.让步,机率,可能性,比率;胜败优劣之别 | |
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8 suburbanite | |
n. 郊区居民 | |
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