// result.value is a NEW view, possibly over different memory
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.
，这一点在同城约会中也有详细论述
FT Digital Edition: our digitised print edition
Мощный удар Израиля по Ирану попал на видео09:41