There are, at present, three difficulties in western countrysides, such as short of funds, great difficulty in construction and long time limit for a project.
阐述了目前西部农村建桥的三大困难：建桥资金缺、施工难度大、建设工期长；
Advanced construction methods are propitious to improve quality and security of construction, shorten the time limit for a project, lower the cost of construction.
先进的施工方法有利于提高结构的施工质量和安全性，并可有效的缩短工期和降低施工成本。
The project completion probability is discussed, which fully describes the uncertainty of construction sequence schedule and provides basis for analysis of time limit.
进行了完工概率分析，较好地描述了施工进度计划的不确定性，为施工工期论证分析提供了依据。
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