高超音速稀薄空气动力学

美国有线新闻 CNN 俄罗斯高超音速导弹发射成功美国防部长称俄新武器不影响美战略

And our first story concerns a weapon that said to be hypersonic, meaning it would travel at several times the speed of sound. Russia's defense ministry says it's conducted a successful test of a hypersonic missile. A nation might want to want a weap

发表于:2018-12-02 / 阅读(93) / 评论(0)

CNN美国有线新闻2018年4月

TED演讲：互联网可能会崩溃,怎么办?(8)

But people won't decide to do it until they recognize the need for it, and that's the problem that we have right now. 但是直到人民意识到真正的需要，才会决定去做，这就是现在的问题所在。 So there's been plenty of people

发表于:2018-12-13 / 阅读(45) / 评论(0)

TED演讲教育篇

TED演讲第8期:从20马赫的滑翔机到蜂鸟无人机的感想(3)

That's an unnatural act for a rocket. 这对于火箭来说，不是一种自然的行为。 The third stage has a camera. 第三次发射，火箭上有一个摄像机。 We call it rocketcam. 我们称之为火箭摄像机。 And it's pointed at th

发表于:2018-12-18 / 阅读(46) / 评论(0)

TED演讲科技篇

美国国家公共电台 NPR Nations Rush Ahead With Hypersonic Weapons Amid Arms Race Fear

STEVE INSKEEP, HOST: President Trump's national security adviser, John Bolton, is in Moscow for a second day today. He's there to discuss President Trump's pledge to withdraw from an arms control treaty that bans certain kinds of missiles. This is on

发表于:2019-01-17 / 阅读(66) / 评论(0)

2018年NPR美国国家公共电台10月

60秒科学:Maple Seed Flight Aerodynamics

What do a hummingbird, a moth, and a maple tree have in common? They all use a similar trick to fly. Okay, okay, a maple tree doesnt fly. But its seeds kind of do. Maples make those little whirlybird seeds you see spiraling down in droves each sprin

发表于:2019-01-30 / 阅读(155) / 评论(0)

60秒科学

美国公司正在研发6倍音速飞机

Lockheed Martin says it's developing a Mach 6 aircraft that would be faster than any other fighter jet. 洛克希德马丁公司日前宣布，该公司正在研发一款速度可达6马赫、比其它所有飞机都快的战斗机。 Called the Hype

发表于:2019-02-06 / 阅读(198) / 评论(0)

英语新闻

辛沛沛NO-BOOK 傻瓜机口语极短句 Lesson 356 I'm improving.

Lesson 356 I'm improving. 1.I'm improving.我好多了。 2.My work is improving.我的工作渐有起色。 3.My health is improving.我的健康善正在好转。 4.I'll improve it.我会加以改进。 5.I want to improve my English.我想提高英语

发表于:2019-02-12 / 阅读(90) / 评论(0)

辛沛沛NO-BOOK 辛沛沛傻瓜机口语极短句

瞬间秒杀听力第288期:人生聚焦在一些微不足道的事情上

You know, most people in life major in minor things. That is, theyre focused on how to make a living instead of how to design their life. They get caught up in the day-to-day experiences that they make real important when actually, in the long term,

发表于:2019-02-14 / 阅读(63) / 评论(0)

瞬间秒杀听力

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a bunch of flowers

A liar is not believed when he speaks the truth.