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.
provide as much warning as possible up front to users when enabling it
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另一个体现刘强东早已布局此事的信息是，Sea Expandary亮相当天，他就透露公司已拿到5条大型游艇订单。
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