As the drillings in a specific survey zone usually are much fewer, it is very difficult to control the variation of reservoir spatially.
但由于工区内钻孔往往稀少，因此，在空间上很难控制油气藏的变化特征。
They applied a complete set of tools to reduce and control the variation in the poorly performing processes and greatly improved the effectiveness and efficiency of those processes.
他们应用一整套工具减少和控制效果差的过程，大大改善了这些过程的效果和效率。
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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