taffrail log
短语拖曳式计程仪，船速仪
词形变化
taffrail logs
复数
taffrail logs
释义与例句
n.
-
1.
A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them.
航海 交通