标签：Resistant 相关文章
By Carol Pearson Washington 28 February 2007 watch Antibiotic Resistance report Penicillin and Erythromycin are examples of antibiotics that used to be one-time miracle cures. These drugs and other antibiotics are now less effective because bacteria
2007年VOA标准英语（二月）
What Do Octane Numbers Mean? At the gas pump, you have a choice of octane numbers. 87? 93? Whats the difference? To explain octane numbers, lets take an imaginative leap into the internal combustion engine of a car. Inside the cylinders are combustio
英语听力文摘 English Digest
What Makes Windshield Glass So Tough? We tend to think of glass as fragilebut in fact, glass is pretty strong stuff. A flawless fiber of glass pulled lengthwise is five times stronger than steel! Although glass is quite strong, its also very brittlea
英语听力文摘 English Digest
By Paige Kollock Washington, DC 20 January 2006 watch Malaria Treatments report The World Health Organization says the most effective cure for malaria could be in jeopardy, unless their new prescripti
2006年VOA标准英语（一月）
By Scott Stearns White House 01 May 2008 U.S. President George Bush is asking Congress for $770 million to help ease food shortages and rising prices around the world. VOA White House Correspondent Scott Stearns has the story. President Bush says he
VOA标准英语2008年（五月）
Agriculture Report - Steps Toward Drought-Resistant Crops, 'Designer' Rice This is the VOA Special English Agriculture Report. A discovery in a laboratory could help lead to new generation of drought-resistant crops. Drought conditions cause plants t
2012年VOA慢速英语(一)月
AS IT IS 2014-05-08 Climate Change Destroys Coral Reefs 气候改变毁坏珊瑚礁 Hello, my friends, and welcome back as we work together to improve your American English. Im Jim Tedder in Washington. Today we will learn more about our changing cli
2014年VOA慢速英语(五)月
East African Farmers Plant Seeds of Innovation East Africa has felt the effects of climate change over recent years. There have been frequent prolonged droughts, erratic seasonal rains and floods, all of which have put food security at risk. As a res
VOA标准英语2012年(九月)
By Brian Padden Jakarta 21 October 2009 Indonesia is one of the most earthquake-prone nations in the world. After the devastating earthquake in Padang last month that killed thousands, disaster-management experts are recommending ways to reduce the
VOA标准英语2009年(十月)
By Selah Hennessy London 21 October 2009 A genetically modified corn plant (file photo) Britain's national academy of science is calling for a multi-billion-dollar research program on global food security. The Royal Society says genetically modified
VOA标准英语2009年(十月)
Obama Highlights Growing US Income Gap 奥巴马关注美国贫富差距加大 WASHINGTON Recent government surveys in the United States show that the income gap between the wealthiest Americans and everyone else is growing. A Congressional Budget Of
VOA标准英语2014年(一月)
By Jessica Berman Washington 19 March 2007 Transgenic mosquito Scientists say they are a step closer to showing that it may be possible to genetically alter mosquitoes to control malaria, a disease that kills more than a million people in developing
2007年VOA标准英语（三月）
By Jessica Berman Washington 12 October 2006 Researchers have developed a new tuberculosis test that makes a diagnosis possible in a fraction of the time it can take using other methods. Experts say the test would be especially useful in the develop
2006年VOA标准英语（十月）
By Efam Dovi Accra 06 December 2006 Officials are meeting in Ghana to discuss ways to get an early start on administering malaria vaccines in Africa. The vaccine is currently on trial in six African countries. Malaria is a major cause of death for c
2006年VOA标准英语（十二月）
Dear Annie: My sister and brother use too many antibiotics. And they both use only as many pills as they need to feel better and save the rest. I've told both of them that abuse of antibiotics is the No. 1 reason we have superbugs that won't be cured
英语听力文摘 English Digest
By Brian Padden Padang, Indonesia 05 October 2009 The emergency response efforts to the earthquake that hit the Indonesian island of Sumatra is shifting to recovery and rebuilding efforts. More than a thousand people died in last week's quake and hu
VOA标准英语2009年(十月)
Runny Nose 流鼻涕 As anyone whos had a toddler knows, theyre incredibly demanding creatures. Armed with an insatiable desire to eat and/or destroy just about everything in their path, these walking embodiment s of unchecked ego can be a handful. E
英语听力文摘 English Digest
Fencing in Bacteria 绿脓杆菌（p.aeruginosa）或称铜绿色假单胞菌，是一种致病力较低但抗药性强的杆菌。广泛存在于自然界，是伤口感染较常见的一种细菌。能引起化脓性病变。感染后因脓汁和渗出
英语听力文摘 English Digest
Rapid Evolution and Population Dynamics 种群（population）指在一定时间内占据一定空间的同种生物的所有个体。种群中的个体并不是机械地集合在一起，而是彼此可以交配，并通过繁殖将各自的基因传给
英语听力文摘 English Digest