Hěnduō rén shuō Wēnzhōuhuà shì zuì nándǒng de fāngyán.
Many people say Wenzhounese is the hardest Chinese dialect to understand.
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Wenzhounese is a variety of 吴语 Wu Chinese, yet even speakers of 上海话 Shanghainese cannot follow it. Its reputation is such that a popular story claims it was used as a spoken code in wartime.