bird\demo\游戏代码和程序\demo.png
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....\Physics2D\delete.bat
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....\.........\UPhysics2D.dcu
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....\.........\UPhysics2DControllers.dcu
....\.........\UPhysics2DControllers.pas
....\.........\UPhysics2DHelper.dcu
....\.........\UPhysics2DHelper.pas
....\.........\UPhysics2DPolygonTool.dcu
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....\.........\UPhysics2DTypes.dcu
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....\demo\游戏代码和程序
....\demo
....\Physics2D
bird