标签：Mammoth 相关文章
'Big Brutus,' World's Largest Electric Shovel, Turned Into Museum LOURDES GARCIA-NAVARRO, HOST: You never know what roadside attraction you might find along America's byways. Our colleague Melissa Block is on a reporting road trip around the country,
2017年NPR美国国家公共电台2月
This is the Virginia opossum, a tree dweller found throughout many of the southern states. It's the only North American marsupial. The young are born premature and matured in the mother's pouch. And its only close relatives today are found in Central
探索与发现2013年
Like a science fiction time traveler, an arctic plant of the late Pleistocene age, over thirty one thousand years old, is growing again after a long frozen sleep. 犹如科幻小说里的时间旅行者，一种曾存活在更新世晚期的极地植物
初学者听力文摘精选
By Anjana Pasricha New Delhi 29 June 2007 India says it is close to finalizing a deal to transport natural gas from Iran to India via Pakistan. As Anjana Pasricha reports from New Delhi, officials from the three countries have held talks in the India
2007年VOA标准英语（六月）
One could imagine that the conflict between Tyrannosaurs and Triceratops may have been one of the greatest combats that nature has ever had. And this well-protected herbivore is everywhere. In fact in the Late Cretaceous, Triceratops outnumbered Tyra
探索与发现2013年
It's a digestive process more like those of carnivores. And Sauroposeidon has another trick for growing to mammoth proportions--hollow bones. Its backbone, neck, and ribs have walls just a few milometers thick. Even its limbs are far less dense than
探索与发现2013年
I mean, these guys were, frankly dumb as a fence post. Sauroposeidon does almost everything by instinct, including rearing or more accurately not rearing its children. It may seem cruel to just dig a hole and leave your eggs and wander on, but its a
探索与发现2013年
These Olympic capabilities come down to one simple anatomical feature, its tail. Half the length of its body, it acts like a built-in counterbalance. By flicking it from side to side, it can make a sharp turn at full speed. If you were to look at Dei
探索与发现2013年
By David McAlary Washington 10 May 2006 There is new evidence in the case of the missing woolly mammoth. In fact, several species of large mammals in addition to the mammoth went missing at the end of
2006年VOA标准英语（五月）