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发表于:2018-12-06 / 阅读(32) / 评论(0) 分类 星际动物园.The.Star.Zoo

A Stationary Satellite, part 2 A geostationary satellite orbitsthe planet at the same rate as the planet rotates, so the satellite is always over the same patch of ground. Cool! you say. Id like to have one of those about twenty feet over my house. S

发表于:2018-12-31 / 阅读(37) / 评论(0) 分类 英语听力文摘 English Digest

A Stationary Satellite, part 1 Some of the best devices in science have been anticipated by science fiction writers years before they existed. Occasionally a writer comes up with an idea that can be put into practice within their lifetime! Such is th

发表于:2018-12-31 / 阅读(38) / 评论(0) 分类 英语听力文摘 English Digest

What Are Solar Tornadoes? Large, Earth bound tornadoes are pretty impressive weather events. Those dark, giant funnel clouds inspire much awe and fear. But theyre nothing compared to so called solar tornadoes solar gases swirling in monstrous formati

发表于:2018-12-31 / 阅读(38) / 评论(0) 分类 英语听力文摘 English Digest

Lost Movie Genre Revived in 'Earth to Echo' 落寞的电影流派地球回声复兴 LOS ANGELES Today's Hollywood movies, even those that appeal to young people, have gotten darker and more violent when compared to family movies from the 1980s. A new

发表于:2019-01-14 / 阅读(30) / 评论(0) 分类 VOA标准英语2014年(六月)

The Most Successful Species on Earth 地球上最成功的物种 For many scientists, a species success is measured by sheer numbers. In that case, the most successful species known to man is a type of bacterium known as S-A-R-11, or SAR-11 for short

发表于:2019-02-24 / 阅读(49) / 评论(0) 分类 英语听力文摘 English Digest

Whats That in the Sky? 不明飞行物 In his book Cosmos , the late scientist Carl Sagan talks about the way in which the earth is regularly struck by material from outer space. These collision s with space debris can be minoras in a shooting star o

发表于:2019-02-24 / 阅读(58) / 评论(0) 分类 英语听力文摘 English Digest

A Fresh Breath of Methane 很早很早以前地球有很微量的氧气,而且地表状况十分恶劣。大气主要是N2和Co2,后来通过复杂的变化,地球开始出现了厌氧型生物。在生命的作用下,地球的氧气开始不断

发表于:2019-03-09 / 阅读(102) / 评论(0) 分类 英语听力文摘 English Digest