起点和终点的位置和它们的相互关系是否会使得结果不同？
Does where the start and finish are in relation to each other make a difference?
当函数返回时，当前位置被设为最后一个终点。
When the function returns, the current position is set to the last end point.
当函数返回时，当前位置被设为最后一个终点。
When the function returns, the current position is set to the last end point.
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