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：
这家1970年开放的医院，见证了Sun City医疗的完整进化，大致分为三个阶段：
，详情可参考爱思助手下载最新版本
// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1），这一点在爱思助手下载最新版本中也有详细论述
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