羟基香樟内酯

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? On June 4th we told you about iron snowflakes on Mercury. Today we have some radical news about the atmosphere of Venus. Literally, a radical is a molecule that reacts e

发表于:2018-12-24 / 阅读(47) / 评论(0) 分类 Scientific American(六)月

Erythromycin,红霉素 Azithromycin,阿奇霉素 Clarithromycin,克拉霉素 Fluoroquinolones and their derivatives (e.g. levofloxacin),多西环素(如:脱氧土霉素) Tetracyclines (e.g

发表于:2019-01-03 / 阅读(39) / 评论(0) 分类 医务英语

分集介绍:导数,商数,正弦和余弦 Derivatives.of.products.quotients.sine.cosine

发表于:2019-01-05 / 阅读(282) / 评论(0) 分类 麻省理工学院公开课:单变量微积分

A: Can I help you? B: Im having trouble finding something. A: What is it that youre looking for? B: I need to find a church. A: What kind of church are you looking for? B: I want to find a Catholic church. A: I believe that theres one on Lake Avenue.

发表于:2019-01-15 / 阅读(56) / 评论(0) 分类 英语情景对话-邻居

As the International Criminal Court's chief prosecutor prepares to issue new arrest warrants in an investigation into the conflict in the Darfur region of Sudan, there is growing speculation that Sudan's President Omar al-Bashir will himself be targ

发表于:2019-02-04 / 阅读(35) / 评论(0) 分类 VOA标准英语2008年(七月)

BEIJING, Feb. 21 (Xinhuanet) -- U.S. actress Lindsay Lohan will host Saturday Night Live on March 3, marking her first return to the show since 2006, according to foreign media reports Tuesday. The former Disney darling rose to fame between 2003 and

发表于:2019-02-06 / 阅读(50) / 评论(0) 分类 英语新闻
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