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.
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圖像加註文字，特朗普誓言將推動醫療價格透明化，並終結「處方藥價格瘋狂上漲」的問題。他譏諷前任總統們「光說不練」，強調自己將採取實際行動解決醫療負擔。分析：特朗普發出愛國號召，卻面臨政治逆風
Today's Connections: Sports Edition is for people who love sports movies and shows.。同城约会对此有专业解读