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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.
因为每一轮技术浪潮真正成熟之前，最先膨胀的往往不是产业规模，而是财富叙事。问题在于，故事成立，并不代表生意成立。