现在的宇宙飞船可以把东西送入太空，但它们不太适合远距离飞行。
Today's spaceships are fine for getting things into space, but they are not so good at travelling long distances.
经过多次远距离的飞行之后再比较两个钟表，结果发现喷气式飞机上的钟表比地面上的钟表跑得慢。
After a number of long distance flights the two clocks were compared and the one that had been on the plane was running behind the clock that had stayed on the ground.
针对高超声速再入飞行器最远距离滑翔制导关键技术，设计了一种新型制导律。
A novel guidance law is devised for developing the guidance technology of optimal glide of a hypersonic reentry vehicle.
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