SSS 2012-06-12
时间：2019-01-08 作者：英语课 分类：Scientific American(六)月
In the day of the dinosaur 1, insects had wingspans of nearly 2.5 feet. So why are today's bugs 3 so puny 4? According to researchers at U.C. Santa Cruz, we may have birds and bats to thank. Their concludes appear in the Proceedings 5 of the National Academy of Sciences. If you ever sat through a high school biology course, you might remember hearing that insects are limited in size by their ability to utilize 6 oxygen. The bigger you get, the harder it is to get O2 to your tissues. And bugs don't have lungs to help. To test the oxygen collection, researchers turned to fossils. They charted the wingspan of more than ten thousands fossilized insects, and found that for the first 150 million years of bug 2 evolution, size tracked closely with atmospheric 7 oxygen levels. The more O2, the bigger the bugs. But then insects started shrinking, even though oxygen continued to rise. This wave of reduction happens to coincide with the emergence 8 of anatomical features that made birds more agile 9 airborne predators 10. And insects got even smaller about 6 million years ago when bats hit the scene. Being little makes you harder to catch---which may have given bugs with teeny wings an evolutionary 11 leg up.
- Are you trying to tell me that David was attacked by a dinosaur?你是想要告诉我大卫被一支恐龙所攻击？
- He stared at the faithful miniature of the dinosaur.他凝视著精确的恐龙缩小模型。
- There is a bug in the system.系统出了故障。
- The bird caught a bug on the fly.那鸟在飞行中捉住了一只昆虫。
- All programs have bugs and need endless refinement. 所有的程序都有漏洞，都需要不断改进。 来自《简明英汉词典》
- The sacks of rice were swarming with bugs. 一袋袋的米里长满了虫子。 来自《简明英汉词典》
- The resources at the central banks' disposal are simply too puny.中央银行掌握的资金实在太少了。
- Antonio was a puny lad,and not strong enough to work.安东尼奥是个瘦小的小家伙，身体还不壮，还不能干活。
- He was released on bail pending committal proceedings. 他交保获释正在候审。
- to initiate legal proceedings against sb 对某人提起诉讼
- The cook will utilize the leftover ham bone to make soup.厨师要用吃剩的猪腿骨做汤。
- You must utilize all available resources.你必须利用一切可以得到的资源。
- Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
- Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
- The last decade saw the emergence of a dynamic economy.最近10年见证了经济增长的姿态。
- Language emerges and develops with the emergence and development of society.语言是随着社会的产生而产生，随着社会的发展而发展的。
- birds and their earthbound predators 鸟和地面上捕食它们的动物
- The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
- Life has its own evolutionary process.生命有其自身的进化过程。
- These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。