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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美国慈善家、乔布斯的遗孀劳伦 · 鲍威尔 · 乔布斯，为整部文集写了一则非常具有智慧和启发性的引言，其中她提到了里尔克的一个金句：