输入或拉动 偏移值(Offset)* 通过点平行(Parallel through point )1). 选取 参考平面(Reference) 及点(Point) 第19页3-1 -3.
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进而通过轨迹样本点分析的方式，得到统计平均的相邻平行截面间距。
Then the statistical average distance between neighboring parallel sections was acquired using the analysis of sample trace points.
只有在近轴光线条件下，平行光通过凸透镜才可近似聚焦于一点。
The parallel light rays of the prnicipal axis that approach a convex lens can converge to the focal point.
用钢笔的话你可以通过排线来制造明暗(画平行线)，交叉排线(平行线相交)，涂鸦，点绘或者其他时髦的笔触。
With a pen, you can shade by hatching (making parallel lines), cross-hatching (parallel lines crossing over parallel lines), scribbling, stippling, or making other funky little marks.
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