Before, many teaching methods were used in English listening class, such as bottom-up or topdown, but the effect was not ideal.
以往，英语听力课教学虽采用了很多方法，如“自下而上”或“自上而下”的方法，但效果并不理想。
The paper also sets up a new concept of bottom air column effect and discusses the action mechanism of bottom air column effect.
文中提出了底部空气柱效应新概念，探讨了底部空气柱效应的作用机理。
The paper also sets up a new concept of bottom air column effect and discusses the action mechanism of bottom air column effect.
文中提出了底部空气柱效应新概念，探讨了底部空气柱效应的作用机理。
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