除非你在空气动力学实验室工作,否则没有人知道汽车在空气的阻力下行驶时,75英里的时速比65英里要多消耗多少能量,事实是这个差距非常大。
Unless you work in an aerodynamic lab, you don't understand how much more energy it takes to push a car through the air at 75 MPH than at 65 MPH, but it's huge.
现代的飞机设计做得很好,但立足于燃料效率来看,飞机是否能设计得更符合空气动力学——降低阻力还是增加动力?
The modern airplane design works well, but from a fuel efficiency standpoint, could planes be designed more aerodynamically — to lower drag and increase lift?
在空气动力学上,升力是重量,推力和阻力(空气阻力)的相关的函数。
In aerodynamic terms, lift is a function of weight, thrust and drag (air resistance).
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