"From when you first wake up, you think, is today going to be the day we get that call?" he said.
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.
。关于这个话题，搜狗输入法2026提供了深入分析
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NYT Pips hints, answers for February 28, 2026