Each time a mouse drag event occurs, a (possibly quite short) black line is drawn between the saved point and the location of the event.
每次发生鼠标拖动事件时，在保存的点和该事件位置之间就会画出一条黑线(可能很短)。
Carefully cut the short dotted lines in the fold position. Stop at the soild black line!
在折痕上小心地裁剪短的那条虚线，剪到黑色实线位置为止！
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