管道的设计和建设的主要部分主要发生在三个阶段。
The design and construction of a pipeline for the most part occurs in three stages.
目前，针对站场管道数据模型的研究仍处于起步阶段。
At present, it is still a virgin field in studying station pipeline data model.
目前，针对站场管道数据模型的研究仍处于起步阶段。
At present, it is still a virgin field in studying station pipeline data model.
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