翻译一小段文章特别是最后一句话

翻译一小段文章,特别是最后一句话 The Yangtze flows eastward from the mountains of Tibet to the South China Sea. It is China’s longest river .Because much of China is mountainous ,people settled around rivers like the Yangtze to take advantage of the water and the rich soil. The Yangtze also provides fish for food . Since it is navigable for most of its 3,600 miles , the Yangtze serves as an important means of transportation, as well as communication.    

参考案 由于3600英里中绝大部分是可通航的水路，长江在交通和通讯上都起着重要的作用。

其他部分比较容易，您就自己翻译吧。