// document_start means these listeners are in place before any element exists
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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.
Plaid valued at $8B in employee share sale。关于这个话题，夫子提供了深入分析
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