反相变换器;倒频变换器

NPR 美国国家电台 2014-09-24

The Pentagon says the US and coalition partners are carrying out air strikes against Islamic state extremist ISIS in Syria. A new front of US operation against the militants. The strikes are sent on Raka where ISISs headquarters are. Canadian border

发表于:2018-12-02 / 阅读(70) / 评论(0)

2014年NPR美国国家公共电台9月

数学英语 40 How to Divide Fractions

by Jason Marshall A few months ago we talked about how to multiply fractions. Now that were comfortable doing this and weve talked about a few applications of multiplying fractions such as how to convert units and how to estimate how fast someone is

发表于:2018-12-07 / 阅读(69) / 评论(0)

数学英语

英语笑话听力+文本：CD唱机

【生词预览】 decipher解读，technicals技术术语【笑话原文】 CD Player While shopping for my first CD player, I was able to decipher most of the technicalses on the promotional signs. One designation had me puzzled, though, so I call

发表于:2019-01-22 / 阅读(105) / 评论(0)

英语笑话（MP3+文本）

鲜为人知的八个科学常识误区

Animals can predict natural disasters 动物能够预知自然灾害 There is no evidence that animals possess a mysterious sixth-sense allowing them to predict natural disasters. Their keen senses of smell, hearing, and sharp instincts alone are eno

发表于:2019-02-01 / 阅读(321) / 评论(0)

实用英语

大众拟用催化转化器修复受影响汽车

Volkswagen has devised a new catalytic converter that could fix the majority of the cars in the US affected by the diesel emissions scandal, as details emerge of its attempts to satisfy regulators. 大众汽车(Volkswagen)设计出一种新的催化转

发表于:2019-02-08 / 阅读(110) / 评论(0)

英语新闻

经济学人178:教育心理学现在你要知道

Educational psychology 教育心理学 Now you know 现在，你要知道 When should you teach children, and when should you let them explore? 什么时候应该告诫孩子，和什么时候应该让孩子自己摸索？ It is one of the oldest deb

发表于:2019-02-16 / 阅读(57) / 评论(0)

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学英语单词

bis-dimethylsilyl-acetamide