一、相关理论和文献 推拉理论(Push and Pull Theory)是研究人口流动最具影响的理论之一，其核心思想是：人口迁移和流动是受流入地的“拉力”和流出地的“推力”共同作用而产生。
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At last, the push and pull theory is introduced in this part.
分析了推力—拉力理论在分析人口迁移过程中的作用。
Based on the push-and-pull theory, this paper analyzes the factors that influence the final realization of the mid and low class's flexible employment.
本文运用推拉理论对影响中低层灵活就业群体最终实现就业的因素进行分析。
This paper analyzes the two operation modes of the push-pull full-bridge bi-directional DC /DC converter and conduct a simulation analysis. In theory, the two-way flow of energy is possible.
文中分析了推挽全桥双向DC/DC变换器的两种工作模式，并进行了仿真分析，理论上验证了其实现能量双向流动的可行性。
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