单词：unsteady aerodynamics
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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
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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
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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
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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,
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