The Chinese language comprises a number of different dialects with Mandarin, Cantonese being the most prevalent. Mandarin has almost 900 million native speakers. Your Chinese interpreter must understand that spoken Chinese has a great amount of internal differences. The common factor is that all spoken varieties of Chinese are both tonal and analytic.
When performing Chinese interpreting, it is important to understand the regional groups. It is estimated that Mandarin has approximately 880 million with Wu approximately 100 million and Min at approximately 75 million and Cantonese at approximately 75 million. This should be taken into account when selecting a chinese translator or chinese interpreter.