| 单词 | patent log |
| 释义 | patent log patent log n.Nautical （名词）【航海】 A torpedo-shaped instrument with rotary fins that is dragged from the stern of a vessel to measure the speed or distance traveled.Also called screw log ,taffrail log 尾航拖曳式计程仪：一种鱼雷状仪器，带有转子，拖在船尾用来测量行速或航行距离也作 screw log,taffrail log |
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