从起点到终点还有很长一段距离。
From the starting point to destination, there exists a long distance.
如果你事先知道，你可以倒着走，用里程表计算从起点到终点的路程。
If you knew in advance, you could have, actually, your car's mileage counter to count backwards from the point where the car will die and start walking.
从起点到终点间寻找一条优先路径，或者仅仅是用来显示一些地方到底在哪。
To find out how to get from our starting point to our destination by our preferred route, or just to show us where things are.
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