All the satellite needs in order to move in its orbit is the initial speed given it by carrier rocket.

卫星要在其轨道上运行所需要的只是由运载火箭给它的初速度。

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The fact that you don't need a force for it to move forever at a given speed in a given direction, that's not obvious, because in daily life you don't see that.

对于物体不需要力的作用就能保持,确定的速度和方向持续运动这一事实,它并非显而易见,因为在日常生活中你看不到这种情况

耶鲁公开课 - 基础物理课程节选

The study estimated that the risk of death for a 70-year-old pedestrian struck at any given speed is roughly equal to the risk of death for a 30-year-old struck by the same vehicle traveling 10 m.p.h. faster.

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Sheffield United player-coach Gary Speed has already been given permission to speak to Swansea.

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That seems all but certain, given the speed with which the industry is deteriorating.

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