但问题是，只盯着蒸馏看，其实有很大问题。
Open up the app and connect to a server in a location with access
，这一点在爱思助手下载最新版本中也有详细论述
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// Stateful transform — a generator that wraps the source
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.