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.
Reporting by Chance Townsend, Caitlin Welsh, Sam Haysom, Amanda Yeo, Shannon Connellan, Cecily Mauran, Mike Pearl, and Adam Rosenberg contributed to this article.
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回家后，我把这段“不顺”的顺风车遭遇告诉爱人，说到气头上，我直言想投诉爽约的车主。“算了，车主也可能确实临时有事，既然已经顺利回到家了，就别再计较了。”他笑着说。
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