The research on pre estimate methodology of new-product development can promote the work at the originality stage, making the ideas more clear.

对新产品开发前评估方法的研究，可以反过来促进新产品开发的创意阶段的工作，使新产品开发创意更加的明确。

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In order to improve the accuracy rate of recognition of handwritten number, the researchers have done a lot of work at the pre-processing stage, feature extraction and classification stage.

为了提高手写数字的识别率，研究者在预处理阶段、特征提取和分类识别阶段都提出了很多方法。

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The test work indicated the probability of a pre-concentration stage using a screening, dense media separation or coarse-ore jigging after crushing and screening.

这个试验工作表明可以通过在进行粉碎和过滤之后对矿石进行再过滤，重阶选矿或者初步汰选的这样一种预浓缩阶段的实现可能性。

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