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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.
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。
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