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确保管道系统是绝缘的。
排水管道系统是城市基础设施的重要组成部分，它的完善程度影响着整个污水处理和水污染控制系统的运行状况和效率。
Drainage system is an important makeup of urban infrastructure, which affects remarkably the operation and efficiency of sewage disposal and control system of water pollution.
这些管道被认为是为灌溉地表而修建的运河系统。
The lines were thought to have been a system of canals that had been built to irrigate the surface.
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