水汽圈

Alien Neighbors 寻访外星人 6

.....green plants ultimately. When it first appeared therefore, it would have been seen as a poison, it would have been a pollutant. But gradually, through Darwinian natural selection, living organism

发表于:2018-12-07 / 阅读(39) / 评论(0)

寻访外星人

SSS 2010-10-07

The clues are adding up to give a picture of a distant Martian past, when the planet had a thick atmosphere that was warm enough for water to stream on the surface. But now the waters gone, and the atmosphere is so thin that any water would boil away

发表于:2019-01-08 / 阅读(50) / 评论(0)

Scientific American(十)月

火星有水意味着什么?

Water on Mars: What Does It Mean? 火星有水意味着什么? For centuries, humans have wondered whether there is life on Mars. Scientists have asked why Mars is losing its atmosphere. Last week, the question was answered with a song. The answer, i

发表于:2019-01-12 / 阅读(30) / 评论(0)

2015年VOA慢速英语(十一)月

TED演讲：人类为什么要重返火星

I want to talk about 4.6 billion years of history in 18 minutes. That's 300 million years per minute. Let's start with the first photograph NASA obtained of planet Mars. This is fly-by, Mariner IV. It was taken in 1965. When this picture appeared, th

发表于:2019-01-18 / 阅读(34) / 评论(0)

英语演讲

英语听力：自然百科神奇水世界 Water-4

Let's look first. The fresh water that we depend on begins its life in the oceans. As the sun's rays beat down on the surface of the sea, they heat the water molecules until some evaporate. It's the start of an extraordinary journey. Here with water

发表于:2019-01-22 / 阅读(27) / 评论(0)

自然百科2010年

VOA慢速英语20060510c

EXPLORATIONS - Venus Express Spacecraft Explores Earth's Mysterious Sister PlanetBy Mario Ritter and Daniel Kirch Broadcast: Wednesday, May 10, 2006 (MUSIC) VOICE ONE: I'm Steve Ember. VOICE TWO: And

发表于:2019-01-30 / 阅读(32) / 评论(0)

2006年慢速英语（五）月

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学英语单词

aliphatic cyclic amine

BIC (bus interface circuit)