The Yangtze River is 6300 kilometres long.The Yangtze River has a length of 6300 kilometres.The length of the the Yangtze River is 6300 kilometres .以上三种都可以。
可以有以下多种表达，其中以第1种表达较为常见：The Yangtze River is 6300 metres long.The Yangtze River has a length of 6300 metresThe length of the the Yangtze River is 6300 metres祝你进步！
芳菲七月
