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.
TikTok熱議「成為中國人」：網民視為反抗西方霸權，官方下場背書
，更多细节参见同城约会
that: a mainframe terminal with a weird physical interface.
30多年前，在福建最贫困的闽东山区任职，习近平同志就明确强调：