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But the friction and heat wears away at the space rock, the hot air actually melts the metal surface, and often the collision with the atmosphere can have a shattering effect, splitting the meteorites along fissures. This is an actual meteorite, and

发表于:2018-12-03 / 阅读(76) / 评论(0)

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发表于:2018-12-07 / 阅读(77) / 评论(0)

火星生命

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Lesson 71 Television Day: Moonflight TV Commentary: Last week we recorded this interview with one of the astronauts who had returned from a recent moonflight. We asked him tc tell us what he had done and what he had seen. We asked him what it was lik

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朗文3L看听学英语第四册

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Here they are! Striated Caracaras, doing what they do best--scavenging. This is exactly the type of scene the National Geographic crew expected to catch on camera when they went to the frigid Falkland Islands. What they didnt expect? Well, the birds

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Stem cells - cells from which a number of more Stimulated saliva - saliva which has been stimulated by chewing. Stippled - a pattern which is made of small dots. Gingiva has a stippled appearance due

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医务英语

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VOICE ONE: This is SCIENCE IN THE NEWS in VOA Special English. I'm Barbara Klein. VOICE TWO: And I'm Bob Doughty. Scientists who study the Earth tell us that the continents and ocean floors are always moving. Sometimes, this movement is violent and

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VOA慢速英语2007年（六）月

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Earth is Always on the Move 地壳总是在运动的 From VOA Learning English, this is SCIENCE IN THE NEWS, in Special English. Im Kelly Jean Kelly. And Im Christopher Cruise. Scientists who study the Earth tell us the continents and ocean floors ar

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2013年VOA慢速英语(八)月

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The few surfaces not covered by signs are often clad in a distinctive, dark green-gray, striated aluminum siding. 这仅存的没有被商标遮盖的建筑，一般都被包裹在有特色的阴暗铝灰条纹的铝制外壁板之中。 Take-out san

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TED演讲商业篇

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SCIENCE IN THE NEWS - Plate Tectonics: Nature's Way of StretchingBy Nancy Steinbach Broadcast: Tuesday, April 18, 2006 (MUSIC) VOICE ONE: This is SCIENCE IN THE NEWS, in VOA Special English. I'm Barba

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VOICE ONE: This is SCIENCE IN THE NEWS in VOA Special English. I'm Bob Doughty. VOICE TWO: And I'm Steve Ember. Scientists who study the Earth tell us that the continents and ocean floors are always moving. Sometimes, this movement is violent and mig

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So all that can be said is that at some slightly indeterminate point as we head toward the center of Earth we leave the asthenosphere and plunge into pure mantle. 因此，我们只能说，在前往地球中心的过程中，我们会在某个不大确

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学英语单词

a pro

acoustic barrier

adsorption gas chromatography

allowed indoor fluctuation of ...

amphipathic, amphipath

angle section of equal legs

brilliant cresyl-blue