Students of human migration speak of "push" and "pull" factors, which influence an individual's decision to move from one place to another.
研究人类迁移的学生们谈到“推”和“拉”因素，这些因素会影响个体是否会从一个地方迁移到另一个地方。
Since there are many factors affecting push-pull air flow, the study on it becomes very complicated.
由于吹吸气流的影响因素较多并且彼此制约，因此吹吸气流的研究十分复杂。
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。
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