Steamboats were not only faster but also transported upriver freight for about one-tenth of what it had previously cost on hand-propelled keelboats.
蒸汽船不仅速度更快，往上游运送货物的成本也只有以前手推运货船的十分之一。
2
First came the steamboat; although flatboats and keelboats continued to be important until the 1850's steamboats eventually superseded all other craft in the carrying of passengers and freight.