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microwave distance measurement | 微波测距法
| Any method of ELECTROMAGNETIC DISTANCE MEASUREMENT based on a comparison of radio microwave signals. | 基于无线电微波信号比较的电磁测距方法。 |
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mid-channel buoy | 中央航道浮标
| A BUOY for marking the middle of a CHANNEL. | 标志航道中央的浮标。 |
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middle ground | 中央浅滩
| A shallow area in otherwise deeper water with CHANNELS on both sides of it. | 在其两边有较深航道的浅水区域。 |
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middle ground buoy | 中央浅滩浮标
| A BUOY marking a SHOAL with CHANNELS on both sides. See BIFURCATION BUOY, JUNCTION BUOY. | 标志中央浅滩的浮标，参见bifurcation buoy（分叉浮标），junction buoy（航道汇合浮标）。 |
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middle latitude | 中分纬度
| Half the arithmetical sum of the LATITUDES of two places on the same side of the EQUATOR. | 处于赤道同侧的两点纬度值代数和（数）的一半。 |
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middle latitude sailing | 中分纬度航法
| See SAILING. | 参见sailing（航法）。 |
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mid-extreme tide | 极中潮位
| See TIDE. | 介于某地极高潮位与极低潮位中间的水位。参见HALF-TIDE LEVEL（半潮面）。 |
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midnight | 子夜
| Twelve HOURS from NOON, or the instant the time reference crosses the LOWER BRANCH of the reference CELESTIAL MERIDIAN. | 正午后12小时的时刻，或时间基准过基准天球下子午圈的瞬间。 |
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mil | 密耳
| 1. 1/6400 of the circumference of a circle. Approximately 1/1000 radian. 2. 1/1000 of an inch. | 1．1/6400圆周,约1/1000弧度。
2．1/1000英寸。 |
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mile | 海里，英里
| A unit of distance. See INTERNATIONAL NAUTICAL MILE, SEA MILE, STATUTE MILE. | 距离单位，参见international nautical mile（国际海里）、sea mile（海里）和statute mile（法定英里）。 |
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military practice area | 军事演习区
| See EXERCISE AREA. | 参见exercise area（演习区）。 |
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Milky Way | 银河系
| A broad, faintly luminous band seen across the sky at night, consisting of innumerable STARS and nebulae, so distant as to be indistinguish... more | 夜晚天空中的一个宽广的微微发光的条带，由数不清的星和星云组成。离地球十分遥远，没有望远镜无法... more |
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millibar | 毫巴
| A unit of pressure equal to 1/1,000 of a BAR. The millibar is much used in METEOROLOGY. | 等于1/1000巴的气压单位，常用于气象学。 |
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milligal | 毫伽
| A unit of ACCELERATION equal to 1/1,000 of a GAL, or 1/1,000 centimetre per SECOND, per SECOND. This unit is used in gravity measurement, ... more | 等于1/1000伽或1/1000厘米/秒2的加速度单位，用于重力测量，约为地球表面平均重力的百万分之一。 |
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mineral development platform | 矿产开发平台
| See PLATFORM: MINERAL DEVELOPMENT. | 用于开采矿产的平台。 |
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minimum squares | 最小平方，最小二乘法
| See LEAST SQUARES. | 参见least squares（最小二乘）。 |
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minimum thermometer | 最低温度计（表）
| See THERMOMETER. | 用于测量某时段内（如一天）最低温度的温度计。 |
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minor control | 次等控制
| See CONTROL: PHOTOGRAMMETRIC. | 参见photogrammetric control（摄影测量控制）。 |
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minor control plot | 次等控制展点图
| See RADIAL TRIANGULATION. | 参见radial triangulation（辐射三角测量）。 |
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minor planet | 小行星
| An ASTEROID. | 一种小行星。 |