Malaysian Chinese don't use the "retroflex" sounds-the "sh" or "zh" that require the tongue to roll upwards-that are used in standard northern Mandarin. One friend of mine was educated in English since she was a child, and sent by her employer to Shanghai to work.
有個朋友是從小受英語教育長大的「香蕉人」，外黃內白，也稱為「二毛子」，被公司派駐上海。