（六）扰乱大型群众性活动秩序的其他行为。
Силовые структуры
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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.。关于这个话题，51吃瓜提供了深入分析
// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1）