zhè tiáo / hé liú / céng jīng / shì / gǔ dài / nán fāng / de / zhǔ yào / shāng dào / chuán zhī / wǎng lái / fán máng

这条河流曾是古代南方的主要商道，船只往来繁忙。

This river was once the main trade route in the ancient south, with busy boat traffic.