能见度差。

Visibility was poor.

《柯林斯英汉双解大词典》

研究了一种基于核的最大散度差准则的文本特征抽取方法。

This paper studied a method of extracting the text features based on the kernel and scatter difference.

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数字化的X射线图像存在噪声且对比度差，给缺陷识别带来一定难度。

The noise and low contrast of the digitized X ray image made it difficult to recognize defect.

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