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.
中国人民解放军和中国人民武装警察部队按照中央军事委员会的规定，做好核事故应急相关工作。
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The difficulty with assessing how far the latest escalation might go, stems in part from the lack of verified information available from either side.，这一点在heLLoword翻译官方下载中也有详细论述
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