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.
-err_detect ignore_err \
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The rocket rose 80 feet into the air and exploded. Had the chemicals been packed slightly differently, he would have been blown to pieces.
30多歲、天生沒有健康子宮的格雷絲・貝爾（Grace Bell）表示，她現在10週大的兒子雨果（Hugo）「簡直是一個奇蹟」。
‘셔틀콕 여제’ 안세영, 전영오픈 2연패 시동