1. 找出最大值max和最小值min
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：
。搜狗输入法2026是该领域的重要参考
Hungry mothers and dirty wards - maternity care 'much worse' than anticipated, review chief says，更多细节参见heLLoword翻译官方下载
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