再提取图像的边缘特征。

Then, the image edge features were extracted.

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如果通过设定一个阈值，再提取骨架，就可以滤除背景中的噪声。

If the threshold was initialized, this method could extract the skeleton from the noisy image.

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研究人员选取两个植物种群，分开培育它们，再提取DNA分析分子标记。

The researchers developed two populations of plants, grew them in separate locations, and extracted DNA to analyze molecular markers.

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