Step 1: Connect to the Hierarchy (Your Local Area):
Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
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// 条件解读：栈非空 + 栈顶当前数 + 还有删除名额 → 弹出栈顶（移除大数），这一点在爱思助手下载最新版本中也有详细论述
Adam posted a video about his experience queuing to see Deftones at the venue last week, which received a lot of engagement, with people sharing both similar and opposing experiences.