Green: Board stuff
经营活动现金流为29.39亿美元，同比增长19.4%。自由现金流为27.77亿美元，同比增长26.7%。
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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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