单词：
单词： 相关文章
Scientists have found that levels of a now-banned chemical are rising again in Earths atmosphere. The chemical is called CFC-11. It is the second most common kind of CFC, short for chlorofluorocarbon. Chlorofluorocarbons were once widely used in many
2018年VOA慢速英语(五)月
From VOA Learning English, this is the Health Lifestyle report. Scientists in Australia say they have developed the worlds first blood test to find a deadly skin cancer in its early stages. They say the test could save thousands of lives each year. C
2018年VOA慢速英语(九)月
Earth's Ozone Layer Shows Signs of Recovery 地球臭氧层出现恢复迹象 The new report says the Earths ozone layer is showing signs of recovery. Ozone is a form of oxygen. It is found in the air we breathe and in Earth's atmosphere. The ozone l
2014年VOA慢速英语(九)月
Students Aim for Aviation History with Human-Powered Helicopter Within reach What seemed impossible when William Staruk began his PhD studies at the University of Maryland three years ago, is now within reach. He's part of a 50-member team developing
VOA标准英语2013年(五月)
Whales, seals and walruses stay warm in chilly water because they have a thick layer of blubber. We humans rely on something like blubberneoprene rubber wet suitsto spend time in cold water. But the thick versions for really icy water are heavy and u
2016年Scientific American(十)月
剑桥雅思11出版后，很多同学都争抢做这本书感受最新的命题趋势。同学们在做剑11 听力的时候发现录音语速的确变快，填空题数量增加。下面网雅思频道就为同学们整理剑11听力中出现的词汇
雅思英语