System introduces alternation between vector map layers and bitmap layers , they can splice randomly and change position.

系统引入了矢量图图层与位图图层的交互，矢量图层可以和位图图层任意叠加、交换位置。

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In addition, customers have two bitmap, when the mouse is in place on the map, it will change the definition for their own cursor.

此外，客户中还有两个位图，当鼠标移动到位图上时，就会改变为自己定义的光标。

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