As long as all was still the pen drew a straight line but while the drum was being shaken the line that the pen was drawing wriggled from side to side.
一切都保持静止时笔将画出一条直线，而当圆筒被振动时，笔画出的线就会蜿蜒起伏。
In the college teaching of traditional Chinese painting, the course "hard-pen line drawing modeling", convenient to collect creation materials, can raise students' ability of shaping.
在高校中国画课程的教学中，“硬笔线描造型”既有利于提高学生造型的能力，又方便搜集创作素材。
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