VOA慢速英语--研究人员发现入侵物种的“善良”一面

Researchers Find Bright Side to Some Invasive Species Non-native species present threats to natural environments across the world by pushing out native organisms. Their presence can seriously damage ecosystems that provide clean water, food and other

Day-Old Mice Grow Back New Heart Tissue After Injury

When humans have a heart attack, heart muscles die after being cut off from their blood supply. But what if the heart could grow new muscle to replace the dead tissue? Some amphibians can regrow body parts, even entire limbs. But humans and other hig

SSS 2008-11-26

Darwin's fabled isles, the Galapagos, are in need of a makeover. And removing invasive species of plants tops the to-do list for the islands restoration. But six species that were set to be exterminated have gotten a reprieve. Because a new study fin

【中级类英语听力】19

We've lost our dog. Luckily he has a tag around his collar and he is also microchipped. It's a smart idea to get your dog microchipped. The microchip is inserted under the skin of the animal. It is done at a veterinarian's office or an animal shelter

SSS 2011-08-10

Invasive species get a bad rapbut we humans are usually to blame for their spread. Take Japanese stiltgrass, an invasive that arrived from Asia nearly 100 years ago as a packing material for porcelain. When it creeps into forests, it forms dense carp

美国国家公共电台 NPR For Berlin, Invasive Crustaceans Are A Tough Catch And A Tough Sell

RACHEL MARTIN, HOST: OK. We're switching gears now over to Berlin, where there is a strange invasion of Louisiana crayfish. The problem reportedly stems from some Berlin residents who bought the fish as pets, only later to dump them in public waters.

2006年VOA标准英语-Minimally Invasive Surgery is New Trend

By Melinda Smith Washington, DC 27 July 2006 watch Surgery report Having surgery used to mean the permanent memento of an ugly scar. But the trend in modern surgery is something called M.I.P., which stands for Minimally Invasive Procedure. There are

VOA标准英语2010年-Invasive Asian Carp Threaten Ecosystem

Asian Carp now outnumber native fish in many areas of the United States and their expansion particularly threatens the fragile ecosystems of the Great Lakes. In an effort to control algae growth, catfish farmers in the southern United States introduc

VOA标准英语2010年-Invasive Asian Carp Harm Commercial Fi

Commerical fisherman Chad Isaak and a partner haul in a boatload of invasive Asian Carp, Jul 2010 The multi-billion-dollar commercial fishing industry in the Great Lakes region of the United States employs more than 800,000 people, but is threatened

VOA英语2010年-Human Health Depends on Biodiversity

There's a good reason why people should be concerned about having a healthy environment containing lots of animal and plant species. A new study says the loss of biodiversity may make humans more vulnerable to infectious diseases. Biodiversity is one

VOA标准英语2010年-Blood Vessel Disease Linked to Dementi

Researchers have identified a link between dementia and the brain damage that can occur in older people with high blood pressure and other forms of cardiovascular disease. High blood pressure, high cholesterol, and other conditions that affect blood

VOA标准英语2014--美用黄蜂对抗甲虫入侵

Wasp Recruited to Fight Invasive Beetle 美用黄蜂对抗甲虫入侵 Scientists are pitting insects against insects in a battle to control an invasive species. U.S. Department of Agriculture researchers have released tiny parasitic wasps in forests

美国国家公共电台 NPR Neurosurgeon: McCain's Recovery From Brain Surgery Might Take Weeks

ROBERT SIEGEL, HOST: As we've heard, Senator John McCain is recuperating from neurosurgery. He had a blood clot removed from over his eye. And to learn more about the kind of surgery he underwent, its risks and what a recuperation might be like, we t

美国国家公共电台 NPR Louisiana Issues Quarantine To Control Invasive Marsh-Killing Bug

SCOTT DETROW, HOST: Louisiana's shrinking coasts face a new threat. In addition to sinking land, sea level rise and erosion, a tiny bug from the other side of the ocean is killing off marshes. This week the state issued an emergency quarantine. Travi

【英语时差8，16】海洋最需

Don: Today, on A Moment of Science, the Ocean's Most Wanted. Sure, they might seem innocent and downright lovely in your aquarium, but released into the wild, your plants and fish can knock aquatic ecosystems right out of balance. Today's invasive sp

VOA常速英语2007-Volunteers Band Together to Help Keep America Be

By Carol Pearson Washington 11 October 2007 One third of the land in the United States belongs to the public. And once a year Americans get a chance to help make these public lands beautiful and healthy for generations to come. VOA's June Soh visited

60秒科学:Beating Heart Tissue from Stem Cells

Beating Heart Tissue from Stem Cells In a study in the journal Science, researchers explain how they used mouse embryonic stem cells and microchip technology to create heart muscle tissue that actually beats. Cynthia Graber reports One of the goals o

VOA标准英语2010年-Eat to Beat Invasive Lionfish

Lionfish are taking over coral reefs in the Caribbean and Atlantic. Here, Lad Akins catches one. In the waters of the Caribbean Sea, a voracious invasive species called the lionfish is threatening to overtake the reefs. Conservation groups are fighti

咱们裸熊 第15期:软糖交易

Okay, here it is. 好啦，就是这里啦。 The date is June 24th. 今天是六月二十四号。 I've found what I believe to be a cave. 我猜我发现的这是一个穴居。 Oh. This furniture looks handmade. 噢，这家具是手工制作的。

经济学人211:入侵物种 繁衍与湮灭

Science and technology 科学技术 Invasive species 入侵物种 Boom and bust 繁衍与湮灭 Invasive Argentine ants may be less persistent than once feared 入侵性阿根廷蚂蚁可能没有想象的那么可怕 Ready for take-off 随时准备离