该城市中许多楼房都存在事故隐患。
A lot of the city's buildings are accidents waiting to happen.
常见的电梯门锁安全电路中，门锁继电器在多种情况下都可能产生误动作，存在事故隐患。
Based on discussion on several common elevator door lock circuits with software, this paper points out some hidden peril of the accident in such circuits, and designs a circuit using PLC.
指出了个体私营汽车加油站普遍存在着的安全事故隐患，同时也对加强个体私营加油站的安全管理，保障个体私营加油站的安全运营提出了若干建议。
Some hidden troubles largely existing in private automobile gasoline filling station are points out, and some advice to enhance safety management and ensure safe working is suggested.
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