标签：specimen 相关文章
14 A Rare Fossil Record The preservation of embryos and juveniles is a rate occurrence in the fossil record. The tiny, delicate skeletons are usually scattered by scavengers or destroyed by weathering before they can be fossilized. Ichthyosaurs had
新概念优美背诵短文50篇
This trail leads to the cave and the freshly dead bison, just out of reach. Hunger makes the bear risk everything. He falls and joins the bison in its tomb. Now he can eat his fill. but after that there's no way out. ln time he'll be just one more ic
探索与发现2012年
Where else would the world's biggest dinosaur live, but in the world's trendiest town? Live may be stretching it a bit. Brachiosaurus brancai has been dead for 150 million years, but he remains impressive, towering more than 13 meters over visitors t
英语时差8，16
In a Colorado gully, hunters carried out a mammoth massacre, leaving behind the remains of at least 16 animals. The site recreated here contains a treasure trove of evidence relating to the mammoth's daily life. Again by comparing mammoth bones to el
探索与发现2012年
From 'The Water's Edge To The Cutting Edge': Fish Skeletons, CT Scans And Engineering MICHEL MARTIN, HOST: So now it's time for a fish tale - no pun intended. Have you ever asked yourself, how can a fish as soft as a stingray crush hardshell prey? Yo
2016年NPR美国国家公共电台8月
Anaconda 水蟒 Before Jennifer Lopez became J. Lo, she was an up and coming actress. Perhaps her worst movie was Anaconda , about a giant snake that terrorizes a documentary film crew in the Amazon rain forest. Hollywoods version of the snake was pu
英语听力文摘 English Digest