不可返回点；无还点：一架飞机飞行中，飞机没有足够的油料返回出发点的那一点。
The point in the flight of an aircraft beyond which there is insufficient fuel for return to the starting point.
返回的矩形可以包含不可单击的点。
The returned rectangle can contain points that are not clickable.
返回的矩形可以包含不可单击的点。
The returned rectangle can contain points that are not clickable.
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