SSS 2008-08-13
时间：2019-01-08 作者：英语课 分类：Scientific American(八)月
This is Scientific American's 60-Second Science. I'm Adam Hinterthuer. Got a minute?
Since so many species in a food web are interconnected, the demise 1 of a one can mean extinction 2 for several others that depend on it for food. Thanks to things like climate change and habitat destruction, this "bottom-up extinction" has ecologists scrambling 3 to save key species. Stefano Allesino says they may just want to Google the problem.
Speaking on August 4th at the Ecological 4 Society of America's annual conference, Allesino outlined a new way to rank the species of an ecosystem 5. Google uses a complicated algorithm to rank web pages that best match a query 6. Basically, a single webpage ranks low, but rises in importance if a handful of other pages link to it. The highest ranked sites have thousands of these well-connected pages linked to them.
Inspired by this system, Allesino’s formula gives importance to a species if it supplies food to another. And, if that species serves as food for several organisms, it climbs up the rankings. Higher ranked species, says Allesino, should become the focus of conservation efforts. And that means there's finally a perk 7 to being the foundation of the food web.
Thanks for the minute for Scientific American's 60-Second Science. I'm Adam Hinterthuer.
- He praised the union's aims but predicted its early demise.他赞扬协会的目标，但预期这一协会很快会消亡。
- The war brought about the industry's sudden demise.战争道致这个行业就这么突然垮了。
- The plant is now in danger of extinction.这种植物现在有绝种的危险。
- The island's way of life is doomed to extinction.这个岛上的生活方式注定要消失。
- Scrambling up her hair, she darted out of the house. 她匆忙扎起头发，冲出房去。 来自《现代英汉综合大词典》
- She is scrambling eggs. 她正在炒蛋。 来自《简明英汉词典》
- The region has been declared an ecological disaster zone.这个地区已经宣布为生态灾难区。
- Each animal has its ecological niche.每种动物都有自己的生态位.
- This destroyed the ecosystem of the island.这样破坏了岛上的生态系统。
- We all have an interest in maintaining the integrity of the ecosystem.维持生态系统的完整是我们共同的利益。
- I query very much whether it is wise to act so hastily.我真怀疑如此操之过急地行动是否明智。
- They raised a query on his sincerity.他们对他是否真诚提出质疑。