Since primitive line segments extraction is an important procedure, how to select the proper line segments extraction approach is the key to the extraction of linear object of SAR images.
对于SAR图像线状目标提取来说，线基元提取是一个非常重要的步骤，如何选择最合适的线基元提取方法影响整个算法的成败。
Each line of wire corresponds to an edge of a primitive.
每条生产线的线对应于一个边的一个原始的。
White blood cells of the more primitive innate system, like neutrophils and macrophages, form the first line of defense against disease.
更原始固有的白细胞系统（例如中性粒细胞和巨噬细胞）形成了抵抗疾病的一线防御系统。
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