单词：ethyl propionate
ethyl propionate的用法和样例：
例句
- Ethyl demethylaminothiazolyloximate is one of the important medical intermediates,which forms side chains of semisynthetic cephalosporins.去甲氨噻肟酸乙酯是合成头孢菌素类抗生素的重要中间体之一。
单词：ethyl propionate 相关文章
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英文魔法师字源大挪移
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
[00:17.36]Figure On The Proch [00:26.40]门廊鬼影 [00:36.51]Back in the early 1980s my aunt lived in a house [00:41.27]that was literally located in the middle of nowhere. [00:46.05]It used to really creep my younger brother and me out, [00:50.28]but
英语灵异故事
[00:17.23]Figure On The Proch [00:26.43]门廊鬼影 [00:35.14]I lay back down and tried to go back to sleep. [00:39.57]After I had lain there for about 5 minutes, [00:43.12]I started to hear a tapping sound. [00:45.77]I listened for a minute, [00:48.07]
英语灵异故事
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
Eva: You ignore customers. You dont help them. 伊芙：你不搭理客人，你没有帮他们。 Nate: Tell me. What can I do? 奈特：那你说该怎么办？
天天练口语
Nate:I dont like my baby picture. 奈特：我不喜欢我的婴儿照。 Eve:Why not? 伊芙：为什么不喜欢？ Nate:I just dont. 奈特：我就是不喜欢。 Eva:But they are cute. Look! 伊芙：但是他们很可爱耶。你看！
天天练口语
You know, I just wanna say one brief thing about something the previous speaker said. I didn't wanna spend too much time on that 'cause I don't think it's important enough. But one thing is worth considering. He's the -- He's the nominal head of an
名人演讲
passion pit乐队，由五个学究男误打误撞组成的一支乐队。Michael angelakos，Ian Hultquisy，Anad ladhamy，Jeff Apruzzese，Nate Donmoyer,从照片上就可以看出这五人不是靠姿色出来混的。身材有点走样，头发有
金属
Larry到李华住的地方，去看她新领养的猫咪小雪球。今天李华会学到两个常用语：mental和pro. LL: Snowball is adorable! She's so little and fluffy! LH: 就是啊，我的猫咪
美国之音《流行美语》
Promising Mosquito Repellent Announced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 6
VOA标准英语2014年(一月)
Rape Allegations Against Actor-Director Nate Parker Resurface AUDIE CORNISH, HOST: The Birth Of A Nation, a new movie based on the story of Nat Turner's slave rebellion in 1831, was poised to be one of the breakout films of the year. The same was sai
2016年NPR美国国家公共电台8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
今天我们要学的词是pro-life。 Pro-life意思是反对妇女有堕胎的选择权。Pro-life的对立面是 pro-choice，支持妇女的堕胎权。美国总统奥巴马不久前在圣母大学发表毕业演讲。Hundreds of pro-life activis
英语每日一词
Eminem 联手 Fun. 主唱 Nate Ruess 单曲《Headlights》MV震撼生猛出炉！这支MV由著名导演斯派克李(Spike Lee)掌镜，《Headlights》回到了当年8英里的取景地底特律拍摄，姆爷典型20012005年说唱风格彻底回归
英文最新流行歌曲
By Jeff Swicord Washington 03 November 2009 For decades, AIPAC (The American Israel Public Affairs Committee) has been the pro-Israel lobby in the United States, bolstered by a massive membership -it says 100,000 - among America's six million Jews.
VOA标准英语2009年(十一月)
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