It's safest to keep a good distance behind in case the car in front suddenly stops.

最安全的办法是在后面保持相当一段距离，以防前面的汽车突然停车。

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Keep a good distance between your skis, so you have room enough to work with both skis, and move your body up-and-down in a rhythmic motion.

你的两只雪板应保持一个恰当的距离，因为你应当给你的雪板一个足够的工作空间，并且使你的身体在滑行过程中有节奏的上下起伏。

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This function does a good bit of position-munging, but it all boils down to a simple idea: Keep constant the precise distance between the mouse cursor and the target object.

该函数做很多位置整理(position - munging)工作，但都可归结为一个简单的思想：不断保存鼠标光标与目标对象之间的精确的距离。

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