贝尔格莱德与萨拉热窝之间距离200公里，坐飞机只需45分钟，如果不是那种以螺旋浆推进的飞机，速度会更快。
The daily flight between Belgrade and Sarajevo takes 45 minutes to cover the 200-odd kilometres; it would be quicker in a plane that was not propellor-powered.
飞机的最高速度实际上增加了，因为工作更有效地推进。
The top speed of the plane will actually increase because of the the propeller working more efficiently.
喷气式飞机的速度越快，它们的推进效率就越高。
The faster a jet plane goes the greater its propulsive efficiency.
喷气式飞机的速度越快，它们的推进效率就越高。
The faster a jet plane goes the greater its propulsive efficiency.
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