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.
榮鼎集團的中歐關係專家巴爾金向BBC中文強調，柏林對於德中關係的未來走向存在深切的擔憂。巴爾金認為，原因在於中國已成為德國在曾經主導的工業領域中的強勁競爭對手。「德國每月失去1萬個製造業崗位，而與中國的競爭是主要原因之一。」
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"Farmers and growers experience both [drought and floods] on an annual basis, and both severely impact their ability to produce food," it said.
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