借助光栅原理，让屏幕发出的光只能从正面特定角度范围内看到，从而实现「大角度防窥」的效果：
}The implementation of this interface will have the AcceptQuest function call the existing quest accepting logic that was previously used by the InventoryService in the live game.，这一点在同城约会中也有详细论述
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