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：
// 栈空 → 无更大元素，返回-1；栈非空 → 取栈顶（第一个更大值），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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From there, Michael took a less conventional path than many Silicon Valley executives by moving into government, serving from 2009 to 2011 as a White House fellow under President Barack Obama, serving as special assistant to then–Defense Secretary Robert Gates at the DOD where he managed projects in Afghanistan, Iraq, and Pakistan and oversaw efforts aimed at reducing bureaucracy to provide resources to soldiers.，详情可参考heLLoword翻译官方下载
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