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。
Drawing a straight line on a piece of stone and make the surface curved naturally on one side, the curved surface sprawl across the other three edges.
在一块石板上刻画一条直线，在线的一侧做成起伏不定的自然曲面，曲面向另外三边自由蔓延。
Drawing a straight line on a piece of stone and make the surface curved naturally on one side, the curved surface sprawl across the other three edges.
在一块石板上刻画一条直线，在线的一侧做成起伏不定的自然曲面，曲面向另外三边自由蔓延。
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