[矿业] 可采厚度

金融世界第八讲(有声)

在上一讲中我们跟您谈了生产和经济活动中的效率，也就是efficiency，包括： 1 productive efficiency 生产效率 2 allocative efficiency 配置效率 3 dynamic efficiency 动态

发表于:2018-12-26 / 阅读(293) / 评论(0)

实用英语

【一起听英语】大脑与政治观

人的大脑的结构会影响人的政治立场吗？ 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 in Lugano, Switzerland for a more complicated topic this week. Were t

发表于:2018-12-27 / 阅读(248) / 评论(0)

一起听英语

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(320) / 评论(0)

六分钟英语

美国国家公共电台 NPR Trump Adviser Says One Of The GOP Nominee's Signature Plans Is 'Not Workable'

Trump Adviser Says One Of The GOP Nominee's Signature Plans Is 'Not Workable' STEVE INSKEEP, HOST: Fifty Republican security experts released a letter yesterday saying Trump is unfit to be president, said he'd be the most reckless president in Americ

发表于:2019-01-17 / 阅读(244) / 评论(0)

2016年NPR美国国家公共电台8月

英语听力：自然百科虫虫兄弟—13

She spun her snell with silkglands on the underside of her abdomen. The threads harden on contact with air. The trap's set, but she's treading carefully. The web's only sticky in places. She can move around, but others can't. The first bite of the da

发表于:2019-01-22 / 阅读(272) / 评论(0)

自然百科2013年

事实：达芬奇眼中的树-Da Vinci’s Rule of the Trees

Pre-Listening Vocabulary observation: something that you see cross section: a view of the inside of something after a cut has been made across it hold true: remain a fact or truth even in other situations ideal: suitable sap: fluid (sugar and mineral

发表于:2019-02-08 / 阅读(521) / 评论(0)

Facts-事实

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(293) / 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(281) / 评论(0)

万物简史

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acoustic image converter

aeroview

agar colony technique