人性的推拉是市场行为的的关键因素。
The pushes and pulls of human nature are key to the behavior of markets.
本文介绍了一种送丝性能稳定、可靠的推拉脉动送丝机及其工作原理，分析了送丝稳定性的影响因素。
A stable, reliable push-pull pulsed wire feeder and its working Principle are introduced. Effective factors of wire-feed stability is also analyzed in this paper.
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。
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.
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