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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：
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英國超市將巧克力鎖進防盜盒阻止「訂單式」偷竊
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Graeme Kearns, chief executive of Foundation Theatres, says: ‘Our job in theatre is to absolutely defend the right to tell stories about culture’