程序代码：

assume cs:code,ds:data,ss:stack

    data segment
       dw 0123h,0456h,0789h,0abch,0defh,0dedh,0cbah,0987h
    data  ends
   
    stack segment
       dw 0,0,0,0,0,0,0,0  ;这段怎么理解呢？？
    stack  ends
   
    code segment
   
start:  mov ax,stack
        mov ss,ax
        mov sp,16
       
        mov ax,data
        mov ds,ax
       
        push ds:[0]
        push ds:[2]
        pop ds:[2]
        pop ds:[0]
       
        mov ax,4c00h
        int 21h
    code ends
    end start