Research on transformation and upgrading of processing trade 并列题名：Research on transformation and upgrading of processing trade Research on the transformation and upgrading of China's foreign trade Research on transformation and upgrading of China's processing trade enterprises Research on transformation and upgrading of Wenzhou merchants Research on the transformation and development of Chinese processing trade Research on the transformation and upgrading of China's marine industry Research on the transformation and upgrading of urban characteristic industries 并列题名：Research on the transformation and upgrading of China's marine industry Research on transformation and upgrading of manufacturing industry cluster in China