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。
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。
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