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.
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);，更多细节参见新收录的资料
Chase Infiniti, One Battle After Another。新收录的资料是该领域的重要参考
In the next section we’ll take this relocation of responsibility to its logical extreme.
politics, DSD-1 later reemerged (with just slight changes) as the Data Encryption