（二）在铁路、城市轨道交通线路上放置障碍物，或者故意向列车投掷物品的；
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：
，这一点在WPS下载最新地址中也有详细论述
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