李:王师傅,领导分配我去立窗口。过去,我没干过这活儿,不知道该怎么干,我想请您给我讲一讲立窗口的知识。王:好。立窗口的方法主要有两种:一种是先立口,一种是后立口。李:什么是先立口,什么是后立口呢?王:先立口就是当墙体砌到窗台下平时开始立口;后立口是在砌墙时预先留出窗洞口,而后将窗口立在预留的洞口内。李:王师傅,您先给我讲一讲怎样先立口好吗? Li: Master Wang, the leadership assigned me to open the window. In the past, I did not do this job, I do not know what to do. I would like to ask you to tell me about the knowledge of the window. Wang: OK. There are two main ways to establish a window: one is to establish the mouth first, and the other is to stand in the back. Li: What is the first place to stand and what is the stand-up? Wang: First, when the wall is erected, it usually stands under the window sill. The rear mouth is to leave the window hole in advance and then the window. Standing in the reserved hole. Li: Master Wang, you first talk to me about how to stand first?