This block of code defines a GEvent.addListener which listens for any map movement (drag, drop, zoom, pan, map type change) and defines the appropriate action to take should it occur.

这段代码定义一个 GEvent.addListener ，它监听所有地图运动（拖、放、缩放、摇移、地图类型切换）并定义相应的操作。

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This system uses the head movement controlled camera pan and tilt to replace pan and tilt's manual operation, and so enhance the efficiency of the remote control operation.

该监视系统采用头部运动来控制摄像机云台，替代传统监视系统中用手动操作来控制摄像机云台的方法，有效地提高了遥控操作的效率。

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