植被系统受到干扰后，会出现弹性极限与塑性极限。
Elastic limit and plastic limit appear after a disturbance to vegetation system.
剧烈干扰的应力在塑性极限或断裂点以上，系统完全崩溃，需要通过人力重新建造。
At the plastic limit or breakpoint of violent disturbance, breakdown of the vegetation system takes place completely and thus artificial reafforestation is needed.
以轧机的弹跳方程为基础，结合轧机的弹跳方程曲线和轧件的塑性曲线分析了各种干扰因素对轧件出口厚度的影响。
Based on the curve of mill elastic deformation and the curve of strip plastic deformation, the influence of some factors on the strip exit gauge is analyzed.
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