How many ports and shipping companies are there in China?
Hainan, Fangchenggang, Qinzhou, Zhanjiang, Guangzhou, Shenzhen, Shantou, Xiamen, Quanzhou, Fuzhou, Wenzhou, Taizhou, Ningbo, Shanghai, Taicang, Zhangjiagang, Jiangyin, Nanjing, Wuhu, Zhenjiang, Nantong, Lianyungang, Rizhao, Qingdao, Yantai and Tianjin.