19世纪初美国邮政使用了气动管精密系统，但伦敦使用了完全不同的方式，建立了这个小规模的铁路系统，只能用于包裹运输使用。
The USPS used an elaborate system ofpneumatic tubes during the early 19th century, but London took anentirely different approach and built this scaled-down railroad systemto be used only for parcels.
至于模仿飞鸟飞行来改善飞机的空气动力学性能，Usherwood也不是完全有信心，但是他也并没有排除这种可能性。
As for imitating avian anatomy to amplify airplane aerodynamics, Usherwood isn't wholly convinced - but he doesn't rule out the possibility, either.
警犬号超音速喷气式汽车研究团队的首席工程师，马克·查普曼(Mark Chapman)说：“我们在这一年里完成了所有的空气动力学的工作，汽车才能完全稳定在马赫为1.3的速度上。
Mark Chapman, Bloodhound SSC's chief engineer, said: "From all the aerodynamic work we have done this year, the car is completely stable at mach 1.3.
蚂蚁已经成为一种气动，完全控制了后滑。
The ant has just become an aerodynamic, perfectly controlled backward-glider.
计算得到的不同流线型列车的整体长细比大小排序与其气动阻力系数排序完全一致。
The order of total slenderness ratios of the five trains is as same as that of aerodynamic drag coefficients.
完全非定常气动力由格林函数方法直接计算，颤振分析结果准确。
For fully unsteady aerodynamic force is calculated with Green's Function method, the results of flutter analysis are accurate.
由于底盘的可靠性等技术上的原因，使得国产气动散装水泥车特别是大吨位的存在种种可能性缺陷，并不能完全满足市场的需要。
Because reliability technical in chassis, air operated bulk cement vehicle has all sorts of flaw, specially great tonnage, can not completely satisfy the market need.
根据飞行控制要求，考虑了影响较大的气动力和气动力矩因素，建立了一个完全表征大机动情况下弹头运动的非线性动力学模型。
According to the demand of flight control system, a nonlinear dynamics model with considerable aerodynamic forces and moments for a large maneuver re entry missile head is built.
但在实际问题中，常需要了解亚音速机翼作完全非定常运动时气动力的变化规律，目前能作这种计算的方法还不多。
The method is capable of computing the varying aerodynamic force or velocity field in time domain over wings with arbitrary motion.
但在实际问题中，常需要了解亚音速机翼作完全非定常运动时气动力的变化规律，目前能作这种计算的方法还不多。
The method is capable of computing the varying aerodynamic force or velocity field in time domain over wings with arbitrary motion.
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