Nowadays, the shape of China social class structure looks like a pear, yet, there exists an intendance to turn to the pyramid-like social class structure shape.
现阶段中国社会阶层结构形态呈生梨型，它存在着向金字塔社会阶层结构形态演变的趋势。
The middle class is a buffer layer in the structure of social interests.
中间阶层是社会利益结构中的缓冲层。
This paper discussed a class of social economic system models structure change point by dynamic programming method, which are illustrated by examples.
本文用动态规划方法讨论了一类社会经济系统模型结构变化点的问题，并通过实例进行了验证。
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