The second part mainly analyzed the group structure of local elites in the early half of 20th century from knowledge structure and career structure.
第二部分，从知识构成和职业构成两个方面，分析了20世纪前半期精英的群体构成。
2
It can guarantee the detection accuracy. In the second step, we introduce the prior knowledge about the road structure to group the line element into macroscopical structure.