Parallel lines are, by definition, lines on the same plane that never join.
按照定义，平行线是在同一平面上永不相交的线。
The definition of plane central curve with positive integer degree was proposed.
给出了平面正整数次中心曲线的定义和中心命题。
The device is by evaluating the image definition to automatically search the focal plane.
该装置借助对图像清晰度评价来自动搜索到正焦面。
The device is by evaluating the image definition to automatically search the focal plane.
该装置借助对图像清晰度评价来自动搜索到正焦面。
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