在语音研究的各个领域，都涉及到语音质量评价的问题，它早已为语音传输系统研究、设计、生产以及使用者所关心和重视。

The speech quality measure has been used in every field of speech investigation and aroused great attention among research, design and production of speech transportation system.

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所以，在多晶材料的研究和生产过程中，都十分重视对晶粒度或组织大小的控制和评定。

So on the research and manufacture process of the polycrystalline materials, it is attached importance to the control and the assess of the size of the grain size or the structure.

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