擦去图案的轮廓，这样会达到很有趣的效果。
You can achieve interesting results by drawing a pattern, coloring some regions and then erasing the pattern lines.
创世基金会董事长曹庆说，棉花棒沾碘酒可在人的背上擦来擦去，所以我想何不在纸上使用棉花棒，这一画就画了20多年了。
Cotton swabs dipped in iodine can be used to wipe someone's back. So I thought, why can't I use it on paper? I've been painting like this for 20 years.
应用推荐