重整后辛烷值增值

英语听力文摘 English Digest 587、气泵上的辛烷值是什么意思？

What Do Octane Numbers Mean? At the gas pump, you have a choice of octane numbers. 87? 93? Whats the difference? To explain octane numbers, lets take an imaginative leap into the internal combustion engine of a car. Inside the cylinders are combustio

发表于:2018-12-31 / 阅读(131) / 评论(0)

英语听力文摘 English Digest

VOA标准英语2011--Dengue Severity Depends on Prior Infection, Genetic Variation

Dengue Severity Depends on Prior Infection, Genetic Variation American and Nicaraguan scientists have discovered the reason why a second infection with dengue can often be much more serious, even fatal, than the first. Dengue is a viral disease sprea

发表于:2019-01-13 / 阅读(143) / 评论(0)

VOA标准英语2011年(十二月)

学个词 Learn a Word-VOA英语教学 3035 experimental

今天我们要学的词是experimental. Experimental 试验阶段的。The House of Representatives rejected a Republican bill that would give terminally ill patients the ability to try experimental drugs. 美国国会众议院否决了一项议案，

发表于:2019-01-26 / 阅读(118) / 评论(0)

英语单词荟萃

Petrol prices surge to near three-year high

WELLINGTON, March 23 (Xinhua) -- Fuel prices are at their highest level in nearly three years in New Zealand on Wednesday after the four main oil companies increased their prices by 3 cents. Shell, Caltex, BP and Mobil have raised the price of 91 oct

发表于:2019-02-02 / 阅读(128) / 评论(0)

英语新闻

学个词Learn a Word 第1488课 exaggerate

今天我们要学的词是exaggerate。Exaggerate, 意思是夸张，夸大。 He tends to exaggerate when talking about his accomplishments, 他谈到自己的成就时总爱夸大其词。北韩上周进行导弹试射，但导弹升空后一分钟就

发表于:2019-02-06 / 阅读(133) / 评论(0)

英语单词荟萃

VOA标准英语2010年-Study Finds Popular Medications Most H

Anti-depressants are widely used to help relieve suffering. But after reviewing previous studies, researchers at the University of Pennsylvania may have hit on something that could change the way anti-depressants are prescribed. The researchers looke

发表于:2019-02-12 / 阅读(130) / 评论(0)

VOA标准英语2010年(一月)

美国国家公共电台 NPR Spit Test May Reveal The Severity Of A Child's Concussion

STEVE INSKEEP, HOST: Every year, more than 1 million children and adolescents sustain a concussion. The symptoms may vanish in days or last for months. And right now, doctors usually cannot predict how long the recovery will take. That could be chang

发表于:2019-02-13 / 阅读(180) / 评论(0)

2017年NPR美国国家公共电台5月

新GRE词汇整理：asperity

GRE改革之后，新GRE词汇量减少20%，但在减少的同时，新GRE对词汇的考察也加大了一定的难度。新GRE词汇是整个考试的基础部分，具有重要地位。以下是2012新GRE词汇：asperity，希望能帮助各位考

发表于:2019-02-25 / 阅读(146) / 评论(0)

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applicable laws and regulations

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backward shift

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