fù / qīn / nián / qīng / shí / cháng / zài / jiāng / shàng / xíng / chuán / duì / shuǐ / liú / fēi / cháng / shú / xī

父亲年轻时常在江上行船，对水流非常熟悉。

When he was young, my father often sailed on the river and knew its currents very well.