Based on research of melting pool of dynamics, the article discussed the reason of melting variation, and pointed out the countermeasure for effective control the variation in production.

本文根据熔池动力学的研究成果分析产生这种熔深易变性的原因，指出了生产中有效控制这种易变性的对策。

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Finally, the reason for stereo-isomer variation of cholestane in different depths and abundances are explained.

最后解释了生物标志化合物胆甾烷的立体同分异构体不同深度丰度变化的原因。

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But, for the reason of kinds of bacteria and variation, a new resistance gene with high resistance and broad-spectrum is still the hot spot researchers interested in.

但由于致病菌小种分化多，而且不断变异进化，寻找新的高抗广谱抗白叶枯病基因仍是热点研究领域。

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But the most important reason for the variation in tabloid cultures is economic.

ECONOMIST: Life in the global gutter

In a conference call this afternoon with Medicare officials, they said there is simply no business reason for such a wide variation.

NPR: 3 min 45 sec