侏罗纪搏击俱乐部 第13期:恐龙的头号武器

Although these were not considered giant predators, they were still packed with muscle. 虽然不是巨型掠食者，它们也相当壮实。 These would've had some bearing on their speed and agility. 这对它们的速度和灵活性会有影响。

Earth and Sky:Spider Widows 蜘蛛寡妇

Spider Widows 蜘蛛寡妇 Spiders give many of us the shivers, though they usually leave people alone. Sometimes these spectacular predators instead prey on each other. Learn more about when spiders serve themselves as dinner -- today on Earth and Sky.

Wild Africa - Deserts 浩瀚沙漠 - 2

In this barren sea of sand, it's harder for larger animals to find enough to eat. You've got to be a real specialist, like the Namib sand snake. By sidewinding, it can swim its way up the dunes. But i

开放陆军仓库或威胁到纽约白鹿

AS IT IS 2015-11-30 Freedom Threatens New York's White Deer 开放陆军仓库或威胁到纽约白鹿 In the 1940s, the U.S. Army fenced 40 kilometers of wilderness in Central New York and turned it into a weapons depot. By chance, the fencing enclo

TED演讲：改变荒漠现状,扭转气候变化(5)

This picture is a typical seasonal grassland. 这张图是典型的季节性草原。 It has just come through four months of rain, and it's now going into eight months of dry season. 刚刚经历了4个月的雨季，将要进入8个月的旱季。

英语听力：自然百科 聪明的猴子

This is a patas monkey, military looking with a fine mustache. It's at home in Savannas, where its too dry for jungle trees. Monkeys have been leaving the trees for millions of years, but we are the only ape to do so. Some of what makes us special co

英语听力：自然百科 大迁徙 Great Migrations—10

A quarter of a million wildebeest will die in their yearly odyssey. In the sun burnt Serengeti, hunger keeps the wildebeests thundering northward, following the rain. A collective intelligence keeps the herd on track, neighbor leading neighbor, along

英语听力：自然百科 吸血鬼乌贼

This menacing-looking squid is just one of many species out of sight and out of mind that could be threatened by human activities far away from the part of the ocean in which they live. The Monterey Bay Aquarium Research Institute has released this v

英语听力：自然百科 天堂岛屿

Ever since man first began setting out for new lands by small boats heading over unknown horizons, he's been searching for among other things, paradise. And paradise in the Tuamotus, a small archipelago in the Pacific about 200 miles northeast of Tah

英语听力：自然百科 走进西藏 tibet—14

Out on the plateau,new-born chiru are vulnerable to predators, so their mothers must try to hide and protect them. The most recent problem faced by the chiru is the new Tibet-Qinghai railway, which cuts right through their traditional migration route

英语听力：探索发现 2012-09-21 长毛象王国 Mammoth—6

In one remarkable discovery recreated here, the head and hide of a large carcass was exposed a unique opportunity for scientists to tap some Ice Age secrets. The remains were of an extinct steppe bison, a longer-horned relative of the North American

【英语趣味课堂】海洋生物学-Marine Biology

Mike: So Dusty, we were talking earlier, and you're telling that you're into marine biology, and that's kind of your background. So, tell me a little bit about why you like - what's your fascination with marine biology? Dusty: Well, the main thing is

英语听力精选进阶版 6187

Can I Come Down Now? 现在我可以下来了吗？ As one of natures top predators, the tiger is not an animal that we would ordinarily think of as being chicken. However, one tiger, which lives in an English zoo, turned out to be more cowardly than

【英语时差8,16】章鱼使用工具-下

But observations of veined octopuses, known as Amphioctopus marginatus, off the coast of Indonesia surprised scientists. Not only do they use coconut shells to hide beneath, they carry the shells with them. Carrying coconut shells is no small feat fo

【英语时差8,16】利用紫外线的鱼

So you want to attract mates. After all, passing on your genes is what evolution is all about. To do that you need offspring, and to get a lot of those you need to be attractive. The flashier the better. Hey, look over here! Sexy me. Ah, but theres t

双语有声阅读：睡眠的进化

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 sleep

2015年12月5日托福口语真题及答案解析

2015年12月5日托福口语真题及答案解析 Task 1 Which one of the following jobs deserves a highersalary? Teacher, policeman or nurse? Personally speaking, I think policemen should getpaid more money than the others for two reasons.Firstly, p

托福听力备考：讲座部分篇章结构之总分结构解题技巧

托福听力，作为整场托福考试中耗时最长，强度最大的部分，一直是所有考生出国留学征程上的拦路虎之一。面对无论是相对接地气的对话部分(Conversation)，还是绝对高大上的讲座部分(Lecture

【英语时差8,16】可怕的鱼-上

The movie Jaws was so frightening that many people who saw the film swore off swimming in the ocean. Consequently, when most people think of fearsome sea creatures, sharks come immediately to mind. Less well remembered is the movie Piranha , a Jaws k

【英音模仿秀】爱唱歌的云雀——根本停不下来

模仿文本： It's very obvious song, might seem extravagant and dangerous. A musical form of the peacock's tail which might impress potential partners but at the same time attract the attention of predators. But bravery or foolishness aside, it's