导弹空气动力学

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(26) / 评论(0) 分类 TED演讲教育篇

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(111) / 评论(0) 分类 60秒科学

By Bill Gasperini Russian President Vladimir Putin says his country is developing a new type of nuclear missile. Mr. Putin spoke at an annual meeting of the armed forces' senior leadership. President

发表于:2019-01-31 / 阅读(53) / 评论(0) 分类 VOA2004(下)--新闻盘点

By Colin Mc McCullough Moscow 16 March 2008 Secretary of State Condoleezza Rice and Defense Secretary Robert Gates are preparing to meet with Russian officials in Moscow to discuss a U.S. missile-defense plan for Europe. Colin Mc McCullough reports f

发表于:2019-02-04 / 阅读(47) / 评论(0) 分类 VOA标准英语2008年(三月)

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(74) / 评论(0) 分类 辛沛沛NO-BOOK 辛沛沛傻瓜机口语极短句

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(41) / 评论(0) 分类 瞬间秒杀听力