单词：ethylacetoacetone(EAA,HEAA)
单词：ethylacetoacetone(EAA,HEAA) 相关文章
Before you listen We suggest you do the vocabulary activity below before you listen. Then listen to the episode and do the first task to check your understanding. Finally, practise some vocabulary and grammar. Match the words and phrases in the boxes
英语听力 大城市小世界
AS IT IS 2014-05-25 Scientists Search for New Ways to Stop Mosquitoes 科学家们寻找新的方法来对付蚊子 The sound of a mosquito can mean trouble in many parts of the world. The bite of a mosquito can be deadly. Today, we will hear about s
2014年VOA慢速英语(五)月
Simple New Test Detects Early Signs of Diabetes 新型简单测试或能检测出糖尿病早期迹象 People with Type 1 diabetes, usually diagnosed in children and young adults, must take insulin injections and watch their diet to keep their blood
VOA标准英语2015年(一月)
美科学家研发新一代驱蚊剂 In many regions of the world, mosquitoes are a seasonal pest. In other regions, they carry serious diseases like malaria. The World Health Organization estimates that almost 630,000 people died of malaria-related
VOA双语新闻 2014年1月
Air pollution outside is easy to spot, hanging over the city, or sputtering from a tailpipe. But there's lot of indoor air pollution, too, even if it's not as obvious. It's caused by volatile organic compounds, or VOCs. They can come from building ma
2016年Scientific American(八)月
by Adam Freedman Todays topic: Can the state force you to attend Alcoholics Anonymous, or similar programs with religious overtones? Before I go any further, Im happy to tell you that this article is brought to you by Carbonite Pro. For a free trial
法律英语 Legal Lad
Dr. Wangari Muta Maathai was born in 1940 in a village in Kenya. In 2004, she became the first African woman to receive the Nobel Peace Prize. The judges valued her contribution to sustainable development, democracy and peace. She is also a member of
各国名人英文介绍
在美国，80%的女孩在她们10岁的时候便开始节食。在这个真实而质朴的演讲中，神经学家桑德拉阿莫特用她自己的故事讲述了大脑是如何控制我们的身体的。她还探索了为什么节食不仅不起作用
TED公开课:吃吧
AS IT IS 2013-08-01 AARP Experience Corps Teaches Children to Read Hello, and welcome back. Im Jim Tedder in Washington. On todays program, encouraging news about some older American citizens who are making a special effort to help young people. And
2013年VOA慢速英语(八)月
ARI SHAPIRO, HOST: A giant, inflatable chicken which looked oddly like President Trump appeared outside the White House on Wednesday. It created a sensation and then disappeared. With her curiosity piqued, NPR's Vanessa Romo went to investigate. VANE
2017年NPR美国国家公共电台8月
ELISE HU, HOST: Tomorrow, a California judge could decide if Gloria Single will be reunited with her husband, Bill. She's 83. He's 93. The two lived in the same nursing home until last March. That's when Gloria Single was evicted without warning. NPR
2017年NPR美国国家公共电台11月
One Police stops on police vehicle outside one Victoria's Bar. After the preparation, as necessary arrests?, this liquor drive slightly mixes. Suddenly he sees to have a young people shakely goes out from bar, spend the many figures only then finds
白领英语晨读
By Cathy Majtenyi Enoosaen, Kenya 11 September 2006 Maasai dancers from Enoosaen village in western Kenya commemorate the 9/11 terrorist attacks that took place in the U.S. five years ago On the fifth anniversary of the September 11 terrorist attack
2006年VOA标准英语（九月）
年底到了，大家免不了吃吃喝喝，有时候我们AA，有时候有人请客，Jenny和Connor要和大家聊一聊关于付钱的英语。 过年吃吃喝喝要怎么说？ Wining and dining: 吃吃喝喝 Wining: 精致的酒水 Dining: 精致
美国文化脱口秀
On its website, a history of the company makes no mention of leador indeed of Thomas Midgleybut simply refers to the original product as containing a certain combination of chemicals. 在它的网站上，公司的历史没有提及铅──也没有提
万物简史
By counting back through these layers and measuring the amount of lead in each, he could work out global lead concentrations at any time for hundreds, or even thousands, of years. The notion became the foundation of ice core studies, on which much mo
万物简史
Lead is a neurotoxin. Get too much of it and you can irreparably damage the brain and central nervous system. Among the many symptoms associated with overexposure are blindness, insomnia, kidney failure, hearing loss, cancer, palsies, and convulsions
万物简史
If you were going to a restaurant and wanted a healthier option, 如果你去饭店，你想吃得健康一点， which would you choose, grilled or fried chicken? 你会选择哪种食品呢，烤鸡还是炸鸡？ Now most people would answer grill
TED演讲教育篇
白洁很喜欢跟她的朋友一起出去吃饭！但是决定谁来付帐会出些问题！所以我们今天一起学怎么用美语决定谁来付帐！ 1) Split it, Splitsies, Split it down the middle = AA付 2) Go threesies 3个人分担 3) I g
OMG美语
Tone Damli Aaberge 《Stupid》：清新摇滚风来袭 Tone Damli Aaberge 出生于1988年4月12日，是位来自挪威的年轻女歌手。当她才17岁的时候，曾参加了2005年那届挪威偶像。可惜她在比赛中获得亚军，屈居于
经典英文歌曲