美国科学60秒 SSS 2013-01-16

Medicinal tablets are nothing new. Doctors have been dispensing pills for thousands of years. Now, archaeologists have turned up some of those ancient medicines which were preserved in a shipwreck for close to two millennia. The 2nd centry Pozzino wr

英语听力：自然百科 野性俄罗斯之西伯利亚 Siberia—2

They disturb a falcon, which in turn disturbs the ravens. Apparently Siberia's 13 million square kilometers still isn't enough space. Howling, the wolf call to arms, gathers the pack and warns other wolves to back off. The chorus can carry for 10 kil

英语听力：探索发现 2012-12-14 冰河新新州 Ice Age Oasis—1

This is Florida, a taste of the tropical, one of the world's most popular holiday destinations. Here mankind's unquenchable desire to explore and colonise reaches astronomical proportions. Eight, seven, six, five, four, three, two, one. Ignition. Lif

60秒科学:城市生活增强感染性疾病抵抗力

The descendants of longtime urban dwellers show increased genetically driven resistance to tuberculosis, due to evolutionary selection pressure over millennia. Christopher Intagliata reports 城市长久居住民的后代，经过数千年的自然选择

VOA常速英语2014--蜜蜂化石揭示气候变化

Fossilized Bees Reveal Climate Changes 蜜蜂化石揭示气候变化 LOS ANGELES For millennia, natural tar that seeped from the ground in what is now southern California trapped large and small animals, preserving their fossils and providing scient

标准美语发音的13个秘诀 CD 4 Track 10

Chapter 7. Tee Aitch CD 4 Track 10 I'd like you to consider words as rocks for a moment. When a rock first rolls into the ocean, it issharp and well defined. After tumbling about for a few millennia, it becomes round and smooth.A word goes through a

科学美国人60秒 SSS 影响地球的不止是太阳和月亮

Jupiter and Venus Squeeze Earth's Orbit The Sun exerts an enormous and obvious influence on the Earth, with its gravity and light. But other bodies also have a small say in our affairs. 太阳用其重力和光线对地球产生巨大而明显的影响

美国科学60秒 SSS 2013-01-21

Medicinal tablets are nothing new. Doctors have been dispensing pills for thousands of years. And now archaeologists have turned up some of those ancient medicines, which were preserved in a shipwreck for close to two millennia. The 2nd-century Pozzi

美国科学60秒 SSS 2013-01-22

Medicinal tablets are nothing new. Doctors have been dispensing pills for thousands of years. And now archaeologists have turned up some of those ancient medicines, which were preserved in a shipwreck for close to two millennia The 2nd-century Pozzin

美国科学60秒 SSS 2013-01-18

Medicinal tablets are nothing new. Doctors have been dispensing pills for thousands of years. And now archaeologists have turned up some of those ancient medicines, which were preserved in a shipwreck for close to two millennia. The 2nd-century Pozzi

美国科学60秒 SSS 2013-01-17

This is Scientific American 60 second Science, I am Sophie Bushwick. Got a minute? Medicinal tablets are nothing new. Doctors have been dispensing pills for thousands of years. And now archaeologists have turned up some of those ancient medicines, wh

英语听力：自然百科 野性俄罗斯之西伯利亚 Siberia—10

But he soon wises up. The thick neck absorbs the blows .The delicate brain is cushioned beneath the core of hollow horns. He defends his claim and relocates his harem. But one challenger won't give up so easily. They can crash at nearly 100 km/h. Eve

VOA标准英语2011--Melting Arctic Could be Major Source of Greenhouse Gases

Melting Arctic Could be Major Source of Greenhouse Gases The melting arctic permafrost could release methane-producing microbes with the potential to accelerate climate change, according to a new study published in Nature. Lead author Janet Jansson,

英语听力：自然百科 黄石公园的夏天 Yellowstone—4

Clues to why the herds are drawn to the Yellowstone plateau lie in its deep and unique history. This plateau is the created bowl of a huge sleeping volcano. And melting rock below the surface still pushes the land up to the cold of high altitude. But

美国国家公共电台 NPR Leaving The Past Behind — Or Trying To — In Rushdie's Latest

ARI SHAPIRO, HOST: The author Salman Rushdie has set his books all over the world. His most famous novels, Midnight's Children and The Satanic Verses, take place in India and the U.K., both countries where Rushdie has lived. His new book is mostly se

美国国家公共电台 NPR In The Rockies, Climate Change Spells Trouble For Cutthroat Trout

DAVID GREENE, HOST: Now we have a story of an unplanned experiment that is underway in the northern Rocky Mountains. Spring is arriving earlier there. And it's generally warmer and drier than before. And that is messing with some of the fish that liv

美国有线新闻 CNN 巴以冲突不断 回顾加沙地带动乱史

We're returning to the Middle East for our first story, where protest in the Palestinian controlled territory of Gaza continued Tuesday. But they were reportedly smaller and less violent than the ones the day before. The Palestinian government says I

英语听力：自然百科 地球力场 Earth's Force Field—19

As the reversal approaches, the decay of our magnetic field will continue and cosmic radiation will get increasingly close to the Earth's surface. As the reversal approaches, the decay of our magnetic field will continue and cosmic radiation will get

英语听力：探索发现 2012-11-09 美洲大平原 American Serengeti—6

The site was once a spring-fed pond, full of water. Mammoths were tempted in to drink. But when they tried to climb back out, the banks were steep and slippery. Just like the short-faced bear imprisoned underground, some became trapped. Scavengers wo

英语听力：探索发现 2012-10-31 美洲大平原 American Serengeti—2

As North America emerged from the grip of the last ice age, the door was opened to outsiders for the very first time. As these early immigrants pushed their way south, they found themselves in a land of an unimaginable opportunity, overflowing with g