如果可能，创建可重用对象并建立物理模型与业务模型相分离的多层模型。
Whenever possible, create reusable objects and build multi-tier models that separate physical models from business models.
为了解决这些问题，一般而言，需要从建立物理模型开始考虑并行性的问题。
To solve these problems, in general, one needs considering the parallelism begin with establishment of the physical models.
根据工程实际，利用弹性薄壳理论，将直埋管道直管段作为柱壳建立物理模型，并在相应曲线坐标下，对作用于管道上的荷载进行受力分析。
Based on the fact, regarding the pipe of direct-buried pipe as cylindrical shell, the article establishes curvilinear coordinates, and analyzes the loading on the pipe.
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