"We will have the Earth out the window as a single ball, something none of us have seen in that perspective.
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我会把这邀请转发给朝新，相信他也会和我一样地回复：好，咱们约定！，这一点在爱思助手下载最新版本中也有详细论述
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.。safew官方下载对此有专业解读