Methods Using Yekang gel bait to killing cockroaches inside the residetial quarters and using hot smog in drainage ditch and heating ditch.
方法用晔康杀蟑胶饵对单位家属楼室内，用拜力坦热烟雾对排水沟、暖气沟进行现场灭蟑实验。
1952 - Great Smog of 1952: a cold fog descends upon London, combining with air pollution and killing up to 12,000 in the weeks and months that follow.
1952年的今天，1952大烟雾：一股寒冷的雾气混杂着污浊的空气降临到伦敦，造成在接下的数周到数月里累计1万2千人的死亡。
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