[求助] 请高手帮我看看这个二维数组

   Public Function GetSubNodes(IntNodeID, byref cv,Field,Retrun)
    If IsNull(IntNodeID) or IsNull(Field) or IsNull(Retrun) Then Exit Function
    Dim i,str
    For i = 0 To UBound(cv,2)
        If CLng(IntNodeID) = CLng(cv(Field,i)) Then
            if Retrun=-1 then
                str = str & i &","
            else
                str = str & cv(Retrun,i)&","
            end if
            If Clng(getFirstSub(cv(0,i),cv,Field,0))>0 Then
                str = str & GetSubNodes(cv(0,i),cv,Field,Retrun)
            End If
        End If
    Next
    GetSubNodes=str
    End Function

    请各位高手帮我看看啊。CLng(cv(Field,i)) 是什么意思啊。里面的cv不是数组吗？为什么还cv(Field,i)啊

 
PS：
    IntNodeID参数是0
    byref cv参数是二维数组
    Field参数是2
    Retrun参数是-1

    GetSubNodes(0,arrMenu,2,-1)