nautical mile

nautical-mile的词性：
n.Abbr. nm, nm, NM（名词）缩写 nm， nm， NM

1. A unit of length used in sea and air navigation, based on the length of one minute of arc of a great circle, especially an international and U.S. unit equal to 1,852 meters (about 6,076 feet).Also called sea mile
海里：在航海和航空上应用的长度单位，按地球大圆一弧分长计，尤指国际和美国单位，相等于1，852米（大约6，076英尺）也作 sea mile