12月20日，平谷线马坊站至马昌营站高架区间施工现场，一段桥梁上部结构正在进行施工转体作业。新京报记者 王贵彬 摄
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Smoke alarms have been around for many decades. The technology has barely changed in recent years – but is modern life slowly outpacing the capabilities of these life-saving devices?
Александра Синицына (Ночной линейный редактор)
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