The characteristic of fluctuation of domestic retail commercial prosperity is rather complicated. This phenomenon is due to the interaction and common effects of various factors.

我国零售商业景气波动的特征是错综复杂的，这一现象的出现，是多种因素相互作用、共同影响的结果。

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Based on the data of a long term field experiment of dryland crops, this article points out that yield fluctuation, expressed in fluctuating coefficient, is a regular phenomenon in dryland farming.

根据旱地作物长期田间试验数据，论述了旱作农业生产中作物产量波动性是一个规律性现象，并用波动系数加以表述。

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The critical factor causing the arc length fluctuation to affect the input heat power to the anode proves to be the phenomenon of the current dispersion in plasma arc itself.

文中指出，弧长波动影响阳极输入热功率的重要因素是等离子电弧本身存在着电流分散现象。

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