坝顶上游面曲率半径

神奇校车 34 - Goes Upstream

神奇校车带领孩子们进入浩瀚的科学领域，游梭于生物科学、地球科学、太空科学、气象学、古生物学等各门学科中。被纽约时报评为最新鲜有趣、最富有创意和想象力的科学启蒙方式。孩子

发表于:2018-12-31 / 阅读(194) / 评论(0)

神奇校车系列丛书

马航失联客机在南印度洋坠毁

KUALA LUMPUR, March 24 (Xinhua) -- New analysis of satellite data suggested that missing Malaysia Airlines Flight MH370 had crashed in the southern Indian Ocean, Malaysian Prime Minister Najib Razak said on Monday. Najib released the sad news at a ha

发表于:2019-01-07 / 阅读(215) / 评论(0)

英语新闻

NPR 2011-03-16

Japan's Transportation Ministry has imposed a no-fly zone over a 20-mile radius around the badly damaged Fukushima Daiichi nuclear plant. A military spokesman says the fears of more radioactive particles leaking from the complex after a fire in three

发表于:2019-01-08 / 阅读(135) / 评论(0)

2011年NPR美国国家公共电台3月

英国文化：英格兰湖区牧羊人过着令人着迷的生活

The Herdwick Shepherd, James Rebanks, is the latest of several generations to have tended flocks in the Lake District, but he now has a book and 45,000 Twitter followers entranced by the starkly beautiful scenes he photographs every day. Here he expl

发表于:2019-01-08 / 阅读(182) / 评论(0)

英美文化

与美国小学生一起学英文第4册第6期:月球

Moon 月球 Do you have any idea how big the moon is? 你知道月球有多大吗？ The moon's radius is 1737 kilometers. 月球的半径长1737千米。 This is just one fourth of our Earth. 它的半径仅仅是地球半径的四分之一。 The d

发表于:2019-01-10 / 阅读(148) / 评论(0)

与美国小学生一起学英文第4册

与美国小学生一起学英文第5册第12期:飓风

Hurricane 飓风 A hurricane is also called a tropical cyclone, typhoon, tropical storm and so on. 飓风也被称为热带气旋、台风、热带风暴等等。 A hurricane is a violent storm. 飓风就是猛烈的暴风雨。 It makes strong winds

发表于:2019-01-10 / 阅读(159) / 评论(0)

与美国小学生一起学英文第5册

VOA标准英语2012--Man Follows Upstream Dream in 'Salmon Fishing in The Yemen'

Man Follows Upstream Dream in 'Salmon Fishing in The Yemen' Dr. Alfred Jones knows pretty much all there is to know about salmon. So when a wealthy sheikh asks him to create fishing streams in the desert, he is, to put it mildly, skeptical. SHEIKH Yo

发表于:2019-01-13 / 阅读(144) / 评论(0)

VOA标准英语2012年(三月)

2018年CRI Three Gorges Dam: Grand project along the Yangtze

The Streaming Down the Yangtze team has arrived in Yichang, Hubei Province and visited the Three Gorges Dam, the world's largest hydropower station. The dam also helps to prevent floods and boost river navigation. The team's passenger ship went throu

发表于:2019-01-19 / 阅读(155) / 评论(0)

2018CRI中国国际广播电台

乔布斯传第118期:像保时捷那样

Like a Porsche 像保时捷那样 Jef Raskin's vision for the Macintosh was that it would be like a boxy carry-on suitcase, 杰夫拉斯金设想中的麦金塔电脑就像一只四四方方的手提箱， which would be closed by flipping up the key

发表于:2019-01-22 / 阅读(157) / 评论(0)

乔布斯传

【文摘】再见，太阳！

Have you ever considered the possibility that the sun will eventually burn out? Don and Yael discuss that sobering thought on this Moment of Science. [OUTSIDE INSECT SOUNDS] D: Wow, what a beautiful s

发表于:2019-01-26 / 阅读(195) / 评论(0)

阅读空间

PBS高端访谈:为什么爱荷华的禽流感爆发的如此猛烈?

HARI SREENIVASAN: As we reported yesterday, the nation's largest egg-producing state, Iowa, has declared a state of emergency following a major outbreak of the avian flu. Millions of chickens and turkeys there and in Wisconsin and Minnesota have been

发表于:2019-01-27 / 阅读(139) / 评论(0)

PBS访谈健康系列

英格兰湖区牧羊人 45000人为之着迷的生活

发表于:2019-02-04 / 阅读(167) / 评论(0)

阅读空间

CCTV9英语新闻：Capsized ship Eastern Star moved upstream

The damaged cruise ship Eastern Star has been moved ten kilometres upstream from where it capsized in the Yangtze River, following concerns the ship may sustain more damage in inclement weather in the area. The capsized ship Eastern Star is towed awa

发表于:2019-02-05 / 阅读(140) / 评论(0)

cctv9英语新闻2015年

China to expand food contaminant monitoring

BEIJING, Jan. 25 (Xinhua) -- China has set a goal of equipping at least half of the country's county-level administrative regions to monitor various contaminants and harmful ingredients in food by the end of 2013. A new work plan, released on Friday

发表于:2019-02-06 / 阅读(172) / 评论(0)

英语新闻

WHO Warns Against Self-Medication as Antidote to Radiation

The World Health Organization (WHO) warns against the indiscriminate(任意的无差别的) use of potassium iodide as a precaution against nuclear radiation. WHO is issuing this advisory following reports of people in Japan and elsewhere who are usi

发表于:2019-02-06 / 阅读(299) / 评论(0)

英语新闻

谷歌收购无人机公司

谷歌收购无人机公司 In its latest purchase of high-tech companies, Google has acquired a manufacturer of solar-powered drones that can stay in the air almost indefinitely, relaying broadband Internet connection to remote areas. It is seen as

发表于:2019-02-06 / 阅读(134) / 评论(0)

英语新闻

AP 2011-05-13

1. River watchers say the Mississippi is starting to level out around Memphis and it could crest tonight, just shy of a record. More than 1,000 people have been forced to flee their homes. 2. Pakistan's prime minister is echoing President Barack Obam

发表于:2019-02-11 / 阅读(208) / 评论(0)

美联社新闻一分钟2011(五月)

美联社新闻一分钟 AP 2015-07-16

1.Euro zone's top officials executively have talked for a whole week for new bailout programme for Greece to be worked out . Under the deal reached Monday, Greece must take measures to reform its economy inorder to find negotiations on the third mult

发表于:2019-02-11 / 阅读(185) / 评论(0)

美联社新闻一分钟2015(七)月

乔布斯传第421期:消灭兼容机(3)

Apple resisted licensing out the Macintosh operating system until 1994, 苹果一直拒绝把麦金塔的操作系统授权出去，直到1994年， when CEO Michael Spindler allowed two small companies, Power Computing and Radius, to make Macintosh

发表于:2019-02-15 / 阅读(191) / 评论(0)

乔布斯传

北京城市副中心等场所将于2020年率先使用5G网络

Beijing expects to implement the pre-commercial service of the 5th generation mobile networks, or 5G, in key locations by 2020, according to a development plan on big data and cloud computing released by the municipal government. 北京市政府近日发

发表于:2019-02-18 / 阅读(181) / 评论(0)

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2-tetradecene

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air contamination analysis