规划道路红线是规划、布局整个城市的基本骨架，是规划部门非常重要的数据信息。
Road red line layout is the framework of layout of the whole city, and thus is very important data for the urban planing department.
第三个层次为稳定性准则优化，它确定横向骨架的个数与位置的最优布局。
The third one belonged to stability criterion optimization that determined the optimal number and position of wing ribs.
它确定横向骨架的个数与位置的最优布局。
The first one belonged to topology optimization that determined the optimal number and position of wing spars .
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