单词：Great Migration
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单词：Great Migration 相关文章
You may have spotted V-shaped squadrons of geese heading south this fall. But for many migrantslike smaller songbirdsnighttime is the right time, when it comes to migration. Winds are gentler. And darkness helps them avoid airborne attacks. Of course
2016年Scientific American(十二)月
A storm system is generating a series of apparent tornadoes, the latest reported in the Midwestern and Southern US. In the tiny Missouri town of Sunset Hills just outside St. Louis, Mayor William Nolan describes being stunned by the damage. It's incr
2011年NPR美国国家公共电台1月
Unit 80 Civil Rights Movement against Segregation in the US During and after World War II, challenges to segregation became more common and more successful. Three major factors accounted for this: -- The Great Migration The great migration was the mo
英语流行话题阅读：语境识词4500
Red couplets, red lanterns, red paper-cuts, red fireworks, red Chinese knots and more there's even red underwear. But it's not just red that's all around there are rats, rats and more rats. According to the Chinese lunar calendar, the upcoming Sprin
英语新闻视频
This is Scientific American's 60-Second Science, I am Karen Hopkin. This'll just take a minute. Biologists, traditionally track migrations by tagging animals with devices that allow their movements to be monitored. But Homo sapiens can't be fitted wi
Scientific American(六)月
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. People get malaria from Anopheles mosquitoes that themselves are infected with a protozoan parasite called Plasmodium. The mosquitoes do have immune sy
Scientific American(三)月
Great White sharks get around,a lot more than scientists thought. A new study in the journal Science shows that the great whites move farther and faster than anyone believed.That is important because it could be influenced the way humans try to prote
2005年NPR美国国家公共电台
These 60 paintings tell about the movement of African-Americans in the first half of the 20th century. Transcript of radio broadcast: 06 July 2008 VOICE ONE: Welcome to THIS IS AMERICA in VOA Special English. I'm Steve Ember. VOICE TWO: And I'm Barb
VOA慢速英语2008年（七）月
Third Great Migration Might be in Progress In the early 20th Century, more than two million African-Americans left their homes and small farms in the South and moved to northern industrial cities to escape overt racism and search for better work and
VOA标准英语2011年(七月)
Its called the Great Migrationthe journey of some six million African-Americans from the rural south to northern and western cities between 1910 and 1970. The cultural impact of the Great Migration has been well documented. But researchers have also
2016年Scientific American(十)月
Then the brilliant masses take to the wing, heading to a place they've never been. Their only map, imprinted on their genes. A mysterious interplay of sun on eyes and antennae, an uncanny sense of magnetic north guides the way. It will take five mont
自然百科2010年
It's a brutal, month-long migration, up to 5 miles, an ultra-marathon for a crab. The cruel sun makes its appearance, threatening them with dehydration. And they face a gauntlet of roads, crisscrossing the island. They stop only to nourish themselves
自然百科2010年
What on earth could drive this headlong rush to slaughter? Only earth herself with her insistent clocks. This story begins in the Great Rift Valley, where the continent is tearing itself apart and being reborn. The plains in the shadow of the rift, t
自然百科2010年
Today, the elements that support the reef are in fine balance--sun, wind and waves. But it doesn't take much to tip the balance, plummeting this huge reef into disaster. It might happen sonner than you think. Eighteen million years ago, a series of r
自然百科2011年
It takes four days for the larva to emerge. It gorges on its own egg case, before turning to tender milkweed. It must grow fat, build up its reserves for the long migration ahead. After two weeks of manic feasting, its body mass now 2,000 times what
自然百科2010年
On Christmas Island, a different kind of home-coming preparation has begun. The males, though exhausted by their long pilgrimage, are readying snug burrows before the demanding females arrive in search of nursery-ready homes. Having dipped in the oce
自然百科2010年
It's a grim end to a short life, but many of the surviving calves will face a more terrifying death. In the Mara River, another migration is culminating. Crocodiles have memorized when and where the wildebeests will try to cross. They have gathered i
自然百科2010年
India Seeks to Counter Possible Backlash onMigration of High-Tech Jobs Anjana Pasricha India is asking Asian countries to resist a potential backlash in developed nations as Western companies move tec
VOA2004（上）--各类新闻
By Scott Bobb Johannesburg 08 November 2007 The European Union has announced a plan to admit 20-million skilled workers during the next 20 years in order to meet projected labor shortages. The proposal has drawn protests from leaders in developing na
VOA常速英语2007年（十一月）