银河系

VOA慢速英语2009年-AMERICAN MOSAIC - Virgin Galactic Plan

HOST: Welcome to AMERICAN MOSAIC in VOA Special English. (MUSIC) I'm Doug Johnson. Today, we play jazz music by a young saxophonist, Hailey Niswanger And answer a question about the history of blue jeans ... But first, we tell about one company's pla

发表于:2018-12-01 / 阅读(187) / 评论(0)

VOA慢速英语2009年（十二）月

Earth and Sky:Galactic Rotation 银河系自转

Galactic Rotation 银河系自转 Astronomers calculate there is ten times more matter in our Milky Way galaxy than we can actually see. Discover how the orbital motions of stars in the galaxy reveal dark matter -- on today's Earth and Sky. JB: I'm Joel

发表于:2019-01-02 / 阅读(196) / 评论(0)

(科普英语)Earth and Sky

VOA慢速英语2018--维珍银河完成载客飞船的测试

Virgin Galactic Completes Test of Spaceship to Carry Tourists Virgin Galactic says its spacecraft designed to launch tourists into space completed an important test flight on Thursday. The rocket ship, called SpaceShipTwo VSS Unity, climbed more than

发表于:2019-01-11 / 阅读(91) / 评论(0)

2018年VOA慢速英语(十二)月

英语听力：2013-11-03 地平线：黑洞吞噬—20

The super bright quasar phase having ended many billions of years ago, when the fuel that fires violent emissions was completely consumed. But now, with the approaching gas cloud and a prospect of feeding, the black hole should get brighter. Exactly

发表于:2019-01-23 / 阅读(85) / 评论(0)

探索与发现2013年

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achmed

Ainsliaea fulvioides

application and maintenance performance

arculus

arisaema monophyllum nakai

aural calculus

automatic double-end edge bander