加马半值厚度

US Spacecraft to Probe Origin of Gamma Rays

By David McAlary The U.S. space agency, NASA, launched a satellite Saturday that scientists hope will help them locate the sources of mysterious gamma ray explosions, the brightest most energetic burs

发表于:2019-01-03 / 阅读(66) / 评论(0)

VOA2004（下）--健康科技

Brains and politics

Alice: Hello, I'm Alice. Rob: And I'm Rob. Alice: And this is 6 Minute English! Weve had a special request from our listeners inLugano, Switzerland for a more complicated topic this week. Were talkingabout the structure of the brain, and how it could

发表于:2019-01-07 / 阅读(93) / 评论(0)

六分钟英语

Sneijder signs deal with Galatasaray in Istanbul

ANKARA, Jan. 22 (Xinhua) -- Dutch midfielder Wesley Sneijder signed a three-and-a-half-year deal with Turkey's Galatasaray in a ceremony held at the club in Istanbul on Tuesday. Speaking to the press at the ceremony, the Dutch player said that he was

发表于:2019-02-07 / 阅读(49) / 评论(0)

英语新闻

X-ray

A young girl was told she needed an X-ray. She went in and seemed especially nervous. When she came out of the X-ray room, she told her mother, They took a picture of my bones.Yes, dear, replied the mother. Did everything go all right?Sure, said the

发表于:2019-02-07 / 阅读(83) / 评论(0)

趣味英语

妊娠糖尿病与心脏疾病有关

妊娠糖尿病与心脏疾病有关 WASHINGTON, March 12 (Xinhua) -- Women who develop gestational diabetes may face an increased risk of early heart disease later in life, even if they do not develop diabetes subsequent to their pregnancy, U.S. res

发表于:2019-02-08 / 阅读(53) / 评论(0)

英语新闻

万物简史第360期:进入对流层(1)

17 Into the Troposphere 第十七章进入对流层 Thank goodness for the atmosphere. It keeps us warm. 谢天谢地，我们有了大气。它使我们有了个温暖的环境。 Without it, Earth would be a lifeless ball of ice with an average te

发表于:2019-02-25 / 阅读(69) / 评论(0)

万物简史

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activable tracer

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