On the basis of summing various test results, it is put forward that surging phenomena and intermittent oscillation phenomena are caused by buckling of blade channel flow field.

在总结历次试验结果的基础上，得出了喘振现象及间歇式振动现象是由多叶风机叶道流场失去稳定性所引起的结论。

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This test analyses the psychological influence of paddlers in their games and puts forward the channel to overcome the negative factor by psychological training.

本文分析了影响乒乓球运动员竞赛心理变化的因素，从重视心理训练等方面提出了减少消极影响的途径。

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