第三步，快速行进算法计算初始水平集形状图像。
Then in the third step, the fast marching method is used to produce the initial level set shape images.
若价格下降，预订接收情况没有增加，则价格应恢复到初始水平。
If the price has been reduced and pickup has not increased then the pricing should be returned to initial level.
在初始水平力作用下，计算两种结构形式在竖向荷载作用时的轴向承载力。
Axial capacity value of two kinds of structure are calculated with the vertical load as the function of initial shear force.
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