SSS 2012-06-06
时间：2019-01-08 作者：英语课 分类：Scientific American(六)月
Some dinosaurs 1 were really huge, and now we may have a better way to estimate just how heavy these giants were. Researchers have developed a method to weigh dinosaurs based on laser scans of their skeletons. The study is in the journal Biology Letters. Looking at a bare human skeleton, how would you guess wether its owner was chubby 2 or svelte 3? If you calculated how much space the fully-fleshed body occupied, you could multiply that volumn by tissue density 4 to find the weight. Researchers laser-scanned 14 modern mammal skeletons to create digital models of each body. These 3-D models were unrealistically scrawny, with skin streched tight ove the bones. But their undersized volumns were consistent, measuring is 21% less than the actual animals. Based on the same information, researchers scanned Giraffatitan bones, added 21% to the digital model's volumn, and then calculated the dinosaur's weight---about 51,000 pounds. The technique could become the preferred way to estimate mass based on skeletons, improving our understanding of how extinct species lived and moved, and helping 5 paleontologists make earth-shaking discoveries.
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- The brontosaurus was one of the largest of all dinosaurs. 雷龙是所有恐龙中最大的一种。 来自《简明英汉词典》
- Dinosaurs have been extinct for millions of years. 恐龙绝种已有几百万年了。 来自《简明英汉词典》
- He is stocky though not chubby.他长得敦实，可并不发胖。
- The short and chubby gentleman over there is our new director.那个既矮又胖的绅士是我们的新主任。
- The countess was tall,svelte and very pale.伯爵夫人身材修长，苗条优雅，面色十分苍白。
- Her figure is svelte.她身材苗条。
- The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
- The region has a very high population density.该地区的人口密度很高。