https://www.youtube.com/watch?v=uAXAA2DceJs 1. control + v 打开visual block，然后选择 2. shift+ i 输入之后按两次esc 删除：
![钢铁平面焊接的缺陷检测案例【附代码】[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)