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40 years later, aero experts coined the term transonic. 40年后空气动力学专家创造了跨音速这个术语。 They debated, should it have one S or two? 他们争论这个术语应该用一个S，还是两个S? You see, they were having trou

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Mother Machree There's a spot in my heart which no colleen may own; There's a depth in my soul never sounded or known; There's a place in my memory my life that you fill; No other can take it no one e

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Mother Machree 慈母颂 Theres a spot in my heart which no colleen may own; Theres a depth in my soul never sounded or known; 在我心中有那么一隅， 任何少女也不能占据。 它埋在我灵魂的深处， 我从不声张从不表露。

英语歌曲:Sing'a Ling 唱啊唱

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Expedite climb to FL190. 21.加速上升到高度190。 Climb to FL280 expedite until passing FL180. 22.上升到高度280，快速通过高度180。 Unable to expedite climb due weight. 23.由于重量原因不能加速上升。 Descending immediate

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Before we take this giant leap, we need to be able to carry everything needed for a three-year -round trip with us. This is a much larger effort than getting to the moon. Its the Apollo mission on steroids. At this point we know at least as much as t

omg美语：1016 OMG!美语 Fangirling!

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GWEN IFILL: After serving in Iraq and Afghanistan, many veterans face an uphill battle finding work in civilian life. There's been an increase in efforts to help ease their transition, but one segment of the veteran population is often overlooked. Sp

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At least the names for the two main possible culprits are entertaining: they are said to be either WIMPs (for Weakly Interacting Massive Particles, which is to say specks of invisible matter left over from the Big Bang) or MACHOs (for MAssive Compact