终于有人把钻墙讲清楚了！Finally someone made it clear about drilling through walls! 

分享如何用合适的钻头在不同墙面开孔，开孔时的注意事项，以及一些老师傅常用的经验技巧。
Share how to use appropriate drill bits to make holes in different wall surfaces, precautions when making holes, and some common experience techniques of master craftsmen.