然而，迄今为止，在研究生教育服务质量问题的评价方面仍然缺乏有效的方法。
However, there is a lack of effective method to evaluate service quality of postgraduate education.
由于这种采煤方法在实际当中很少应用，目前还缺乏这方面的系统理论研究。
For this mine method is few applied in fact, and lack theory study in this method at present.
但是BF型柔性传动的设计在国内还缺乏深入的研究。
But the design of BF flexible transmission is still lack in the thorough research.
然而这些模型在模糊环境下如何应用，尚缺乏研究。
However there is a little study on how to apply the models to fuzzy environment.
然而这些模型在模糊环境下如何应用，尚缺乏研究。
However there is a little study on how to apply the models to fuzzy environment.
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