The only hindrance faced by the business delegations which arrive to Shenzhen and Guangzhou is the language barrier. Two languages spoken most widely are Cantonese and Mandarin, while Hokkien, Hunanese and Teochew are also spoken in Shenzhen.
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Local Chinese exhibitors can to an extent converse in English, but for formal business meetings and going through contracts/documents it is essential to have a native Shenzhen Interpreter and Guangzhou Interpreter. Choosing the right interpreter is very essential as the person will be your voice forth the local market through out the trip and any miscommunication can cause all the efforts to go down the drain.
