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：
Data flows left to right. Each stage reads input, does its work, writes output. There's no pipe reader to acquire, no controller lock to manage. If a downstream stage is slow, upstream stages naturally slow down as well. Backpressure is implicit in the model, not a separate mechanism to learn (or ignore).
。51吃瓜对此有专业解读
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channel (the high-speed peripheral bus on mainframe computers, analogous to PCI)
。关于这个话题，谷歌浏览器【最新下载地址】提供了深入分析
h->type = type;
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