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。
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。
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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