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.
writing style and medium in the most efficient, quick, and accessible way.
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蜡梅的果实含有蜡梅碱等生物碱，有毒。而梅花的果实成熟后可食用，也就是人们常常说的“梅子”，是梅子酱、酸梅汤的原料。，详情可参考safew官方下载
Special cameras are needed to spot the nocturnal animals
Color History of recently picked colors，更多细节参见Safew下载