多个双引号问题（弱弱）

问个弱弱的问题。在vb.net2005中，若有连续多个双引号，如何理解程序的显示结果？
如：
Dim j As String = "Joe said ""Hello"" to me."
Dim h As String = "Hello"
' The following messages all display the same thing:
' "Joe said "Hello" to me."
MsgBox(j)
MsgBox("Joe said " & """" & h & """" & " to me.")
MsgBox("Joe said """ & h & """ to me.")
//这是msdn给的例子,如何理解？
Dim aa As String
  aa = """" & "我是中国人" & """"

  MsgBox(aa)


输出："我是中国人"，如何理解程序的执行？我知道字符串中两个引号可以理解为一个引号？

" 可以理解成转义符：
比如这句：
Dim j As String = "Joe said ""Hello"" to me."
输出应该是 Joe said "Hello" to me.

两个""表示一个"

同意。