Zhu Wenfeng (C), a service team member from the State Grid Corporation of China, introduces how to find faults of electric sockets to Iranian businessman Hamid-Dehghani (L) in Yiwu City, east China's Zhejiang Province, Aug. 23, 2012. The corporation has set up the team to provide foreign businessmen with information about how to use electricity safely and ensure power supply. By the end of last year, 13,000 foreign businessmen stay in Yiwu, nicknamed "the world's supermarket" of small commodities. (Xinhua/Tan Jin)

Liz Ghafarshad, an American English teacher, trains service team members from the State Grid Corporation of China in English dialog, in Yiwu City, east China's Zhejiang Province, Aug. 23, 2012. The corporation has set up the team to provide foreign businessmen with information about how to use electricity safely and ensure power supply. By the end of last year, 13,000 foreign businessmen stay in Yiwu, nicknamed "the world's supermarket" of small commodities. (Xinhua/Tan Jin)

Zhang Yi (1st R), a service team member from the State Grid Corporation of China, explains safe use of electricity to foreign businessmen in the Jimingshan Community of Yiwu City, east China's Zhejiang Province. The corporation has set up the team to provide foreign businessmen with information about how to use electricity safely and ensure power supply. By the end of last year, 13,000 foreign businessmen stay in Yiwu, nicknamed "the world's supermarket" of small commodities. (Xinhua/Tan Jin)