一个反复的过程允许开发团队更好地适应变化，获得反馈并将它分解到项目中去，从而尽早地减少风险，动态调整过程。
An iterative process allows the development team to better accommodate change, to obtain feedback and factor it into the project, to reduce risk early, and to adjust the process dynamically.
把滴形管的强度分析问题分解为：沿管轴线方向的压力问题与管沿周线方向均布压力的平面应变问题的叠加。
The strength analysis of a drop-shaped tube is resolved into the following problem: axial compression together with a plane state of strain with uniform internal pressure.
进一步在边界层区域将三维的边值问题分解成二维的平面应变和扭转问题。
Furthermore, the 3-d boundary value problem in boundary layer region is decomposed to 2-d plane strain and torsion problems.
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