参考翻译:
China's water transport has a long history.Early in the Shang Dynasty,there were sailing boats.The Grand Canal in the Sui Dynasty provided great convenience for south-north water transport.In the Ming Dynasty,Zheng He sailed across seas seven times and reached the east coast of Africa during one of his voyages.China has plenty of rivers,a long coastline and advantageous water transport conditions.The Yangtze River is the most important inland shipping channel.Its mainstream,from Yibin in Sichuan Province to the sea,has a total length of over 3,000 kilometers.Chongqing,Wuhan and Nanjing are important ports along the river.China has fevorable conditions for maritime transport with many harbors,such as Shanghai,Dalian,Qinhuangdao,Tianjin,Qingdao,Ningbo,Xiamen,Guangzhou and so on.There are shipping routes from these ports to over 150 countries and regions all over the world.