The Tongji ditch and the Yongji ditch are two important constituents of the Sui-Dynasty Grand Canal,they had played the vital role in the Sui and Tang dynasties and even later successive dynasties.是什么意思_The Tongji ditch and the Yongji ditch are two important constituents of the Sui-Dynasty Grand Canal,they had played the vital role in the Sui and Tang dynasties and even later successive dynasties.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句