标签：predators 相关文章
17.Evolution of sleep Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles. There is some evidence that the two types of s
新概念优美背诵短文50篇
The deal is done. What a bloody hell! I'm Rupert Murdoch, the billionaire tyrant, and this is my newspaper!If you are Rupert Murdoch, prove it! Hi, Rupert! e,oh. It's official, media-baron Rupert Murdoch has bought the Wall Street Journal. Adding it
商业报道2007年
Guppy Groups Provide Friendly Protection against Foes大敌当前小鱼也会为朋友两肋插刀 Humans aren't the only species that forms friendships. Lots of animals prefer to spend their time only with certain individuals. 人类并不是唯一一
2017年Scientific American(六)月
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
This triggered other dramatic changes. As sea levels dropped, so did the inland water tables. Florida's fresh water drained away through the porous limestone rock. Pools dried up and springs diminished. Florida was on the brink of drought. And animal
探索与发现2013年
Drones Help Scientists Spot Australia's Endangered Koalas 无人机帮助科学家发现澳大利亚濒危的考拉 Small endangered animals are often hard to find in their natural habitats, making it difficult for scientists to monitor them and deve
VOA标准英语2015年(三月)
Pakistani lawmakers have denounced Wednesday's raid by foreign troops in Pakistani territory, passing a resolution condemning the operation and vowing to repel similar attacks in the future. The Pakistani military warned such operations could provoke
VOA双语新闻 2008年9月
Screams Heard Round the Animal World 人类与生俱来的尖叫声识别能力 What does panic sound like? clip of Homer Simpson scream Like that, for sure. But also like this pig sound. And this chickadee sound . But maybe you already knew that. Be
2017年Scientific American(八)月
Bison calves are born in summer and can run within a few hours of their birth. They have no choice. The herd won't wait in its eternal quest to find new grazing. Smaller grazers are still found here, too. But they stay put instead of wandering the pl
探索与发现2012年
Tyrannosaurus Rex was of ten thousand pound, self-propelled, antitank weapon. Now, sixty five million years later, cutting-edge imaging technology lets us look deep inside their bodies to reveal just how the worlds greatest carnivores really work. Di
探索与发现2013年
The jaws of T-Rex are infamous and lethal, housing sixty teeth with some as long as 30 centimeters. Its skull is constructed of 64 bones designed to be light but strong. Its 16 times stronger than the jaws of an alligator. The front teeth are dagger-
探索与发现2013年
Hearing, smell and sight are all well refined. We can look at the sense of vision and see the attributes of a predator. T-Rexs eyes are 40 centimetres apart providing exceptional binocular vision, the ability to perceive depth. An eye is essentially
探索与发现2013年
Sauroposeidon towers over Deinonychus. In fact, its mammoth size is its primary defense. But this giant begins life very small. For Deinonychus, Sauroposeiden would be a great meal, at least the juveniles, because there wouldve been lots of them and
探索与发现2013年
They are actually increasing their chance of getting a meal. Its a strategy still used today. Working together, lions will take on prey as big as a four-ton elephant, and they only have teeth and claws. Deinonychus employs an array of weaponry more p
探索与发现2013年
By Brian Wagner Washington 16 September 2009 Miami Beach is a top destination for vacationers from around the world -- not to mention a location for sea turtles laying eggs. For eons, female sea turtles have returned to the beaches where they were b
VOA标准英语2009年(九月)
Pakistani lawmakers have denounced Wednesday's raid by foreign troops in Pakistani territory, passing a resolution condemning the operation and vowing to repel similar attacks in the future. VOA's Barry Newhouse reports from Islamabad that the Pakis
VOA标准英语2008年（九月）
Lion Conservation Challenges Giraffe Protection The giraffe is an icon of the African savannah. The lion is the top predator of the ecosystem. Both animals face uncertain futures, and both are subjects of intense, ongoing conservation work. Now a stu
2018年科学美国人2月
Boat Noise Means Fish Can't Learn Their Lessons If you've ever gone snorkeling or scuba divingyou know how peaceful it sounds under there... aside from the crackling sound of snapping shrimp. 你如果浮潜或者潜过水，就会知道水下听起来
2018年科学美国人3月
Are you afraid of sharks? What about snakes or spiders? Put those fears aside: because in the U.S. youre far more likely to be killed or injured by a deer bounding across the road. Bambi and his kind cause more 200 humans deaths each year, plus some
2016年Scientific American(八)月
Seed Dormancy 种子休眠是，有生活力的种子由于内在原因，在适宜的环境条件下仍不能萌发的现象。休眠是植物在长期系统发育过程中获得的一种抵抗不良环境的适应性。具有休眠特性的农作物种
英语听力文摘 English Digest