Reporting contributed by World Business Express
Harriet BradshawScience reporter，详情可参考heLLoword翻译官方下载
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В воскресенье, 1 марта, в Москве потеплеет до плюс 4 градусов Цельсия. О росте температур предупредил жителей столицы синоптик прогностического центра «Метео» Александр Ильин в беседе с RT.。业内人士推荐safew官方版本下载作为进阶阅读
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.