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.
Фото: Arafat Barbakh / Reuters
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其中一份電郵草稿以基金會員工的語氣寫成，看似是一封辭職信，抱怨曾替蓋茨取得某些醫療物品，「以處理和俄羅斯女子發生性行為的後果」。