本文提出了假想零线的方法，概念清楚，能够大大简化计算过程。
The paper presents the supposed zero line method which has clear concept and can simplify the calculation procedure.
为了简化计算过程，本文编制了城市燃气管网土地利用安全规划软件。
To simplify the calculation process, this paper develops software of land use safety planning for the city gas pipeline network.
使用这种计算方法可以简化计算过程，同时能满足工程设计的精度要求。
To use this calculation method can simplify the calculation course, at the same time, it could meet the accurate requirement of engineering design.
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