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(48) / 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(41) / 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(286) / 评论(0) 分类 麻省理工学院公开课:单变量微积分

Before I talk about that, 谈到这之前 I've written down at the bottom there 我在底下标出了 the slope of this curve, this straight line. 这条曲线的斜率,即这条直线 It's three-quarters, roughly, 大约为3比4 which is less than

发表于:2019-02-13 / 阅读(46) / 评论(0) 分类 TED演讲教育篇

托福常用词汇表

发表于:2019-02-25 / 阅读(62) / 评论(0) 分类 英文语法词汇

托福8000词汇怎么背?新东方托福考试网分享托福熟词僻义词汇总结:,让我们一起背单词吧。 address v. 应付,处理(问题等) aging n. n陈酿 appropriate v. 擅用,挪用,占用,盗用 article n. 物品;制品,

发表于:2019-03-13 / 阅读(456) / 评论(0) 分类 雅思英语