常見例句a downbound channel; the downbound train. 下行的水道；下行的火車。downbound commerce (=downbound traffic) 下行(下水, 南下)運量downbound exit 下行(水)出牐時間downbound entry 下行(水)進牐時間downbound tows 下行(頂推)駁船隊 返回 downbound