走在城市的街巷、居民区、大市场……最怕的是祸从天降,那些年代久远、锈迹斑斑、摇摇欲坠的外置防盗窗(俗称防盗网)突然从上面掉下来砸到头。在城市,往安全方面考虑,许多单元房都安装了像鸟笼一样的防盗网,殊不知这些防范措施在给主人带来安全的同时,也留下了不安全的隐患和弊端。目前,防盗网存在的问题日益变得突出…… Walking in the city streets, residential areas, the big market ... What is most afraid of disaster from heaven, those old, rusty, crumbling external security window (commonly known as anti-theft network) suddenly fell from above to hit the head. In the city, in terms of safety, many units are equipped with cage-like anti-theft networks. Everyone knows that these precautions bring safety to the owner and meanwhile leave unsafe hidden dangers and drawbacks. At present, the problems of anti-theft networks have become increasingly prominent ...