美国科学60秒 SSS 2013-05-24
时间：2018-12-24 作者：英语课 分类：Scientific American(五)月
What had the legs of agator and the jaws 1 of fish? Why the earliest land animals? Because a new studies shows that animals evolved weight-bearing limbs long before they had the chambers 2 to really take advantage of a terrestrial diet. The research is in the journal Integrative and Comparative Biology. Scientists had suspected that the first four-legged creatures to haul their carcasses out the ocean didn't belly 3 up to the salad bar straight away. But they lacked definitive 4 proof. Now, researchers have carefully examined the fossil like faces of 89 beasties lived on land and sea, some 300 to 400 millions years ago. They probed the jaws for a range of biomechanical features, such as how much force they can give to their bite. The result: seems it took tens of millions of years after setting food on land to come up with the mouth that could munch 5 on the greenery. Why the leg? Could be the critters had stop being mouth breathers and shift from using gills to using lungs, which freed their jaws to develop in new ways. And which left no more excuses to not eat their veggies.
- The antelope could not escape the crocodile's gaping jaws. 那只羚羊无法从鱷鱼张开的大口中逃脱。
- The scored jaws of a vise help it bite the work. 台钳上有刻痕的虎钳牙帮助它紧咬住工件。
- The body will be removed into one of the cold storage chambers. 尸体将被移到一个冷冻间里。 来自《简明英汉词典》
- Mr Chambers's readable book concentrates on the middle passage: the time Ransome spent in Russia. Chambers先生的这本值得一看的书重点在中间：Ransome在俄国的那几年。 来自互联网
- The boss has a large belly.老板大腹便便。
- His eyes are bigger than his belly.他眼馋肚饱。
- This book is the definitive guide to world cuisine.这本书是世界美食的权威指南。
- No one has come up with a definitive answer as to why this should be so.至于为什么该这样，还没有人给出明确的答复。