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	Term	术语	Definition	定义
	mean range (of tide)	平均潮差	The difference in the HEIGHT between MEAN HIGH WATER and MEAN LOW WATER.	平均高潮和平均低潮间的潮高差。
	mean rise (of tide)	平均潮升	The HEIGHT of MEAN HIGH WATER above the CHART DATUM.	至海图基准面的平均高潮高度。
	mean sea level	平均海（平）面	The average HEIGHT of the surface of the SEA at a TIDE STATION for all stages of the TIDE over a 19-year period, usually determined from h... more The average HEIGHT of the surface of the SEA at a TIDE STATION for all stages of the TIDE over a 19-year period, usually determined from hourly height readings measured from a fixed predetermined reference level (CHART DATUM).	某验潮站在19年周期内所有潮汐阶段的海面平均高度，通常由至固定预设参考水准面（海图基准面）的每小... more 某验潮站在19年周期内所有潮汐阶段的海面平均高度，通常由至固定预设参考水准面（海图基准面）的每小时潮高读数确定。
	mean solar day	平太阳日	See DAY: SOLAR.	参见solar day（太阳日）。
	mean solar time	平太阳时	See TIME.	根据平太阳周日运动计算的时间，假定平太阳在天球赤道上作匀速运动，一回归年环绕一周，通常简称mean ... more 根据平太阳周日运动计算的时间，假定平太阳在天球赤道上作匀速运动，一回归年环绕一周，通常简称mean time（平时）。
	mean sounding velocity	平均声速	Mean values for VELOCITY OF SOUND through the vertical water column of specific DEPTHS based on different VELOCITIES OF SOUND in different... more Mean values for VELOCITY OF SOUND through the vertical water column of specific DEPTHS based on different VELOCITIES OF SOUND in different sections of the column. These values yield more nearly correct DEPTHS when sonic DEPTH FINDERS are used. The VELOCITY OF SOUND at any specific DEPTH may differ considerably from the mean.	声波在不同区域水层的速度不同，平均声速是指声波在特定深度的垂直水层中速度的平均值。当使用回声�... more 声波在不同区域水层的速度不同，平均声速是指声波在特定深度的垂直水层中速度的平均值。当使用回声测深仪时，这些值可得出更近似于正确的深度。任何特定深度的声速均可能与平均值有相当大的不同。
	mean sphere depth	平均地球深度	The uniform DEPTH to which the water would cover the EARTH if the solid surface were smoothed off and were parallel to the surface of the ... more The uniform DEPTH to which the water would cover the EARTH if the solid surface were smoothed off and were parallel to the surface of the GEOID. The accepted figure for this DEPTH is 2,440 METRES. The mean DEPTH of the SEA is 3,800 METRES.	指假定地表光滑且与大地水准面平行，覆盖地表的水体的均匀深度。该深度的公认值为2440米。海洋的平均�... more 指假定地表光滑且与大地水准面平行，覆盖地表的水体的均匀深度。该深度的公认值为2440米。海洋的平均深度是3800米。
	mean spring range	平均大潮差	See SPRING RANGE.	参见spring range（大潮差）。
	mean spring rise	平均大潮升	The HEIGHT of MEAN HIGH WATER SPRINGS above the CHART DATUM. Also called spring rise.	至海图基准面的平均大潮高潮高度。亦称spring rise（大潮升）。
	mean square error	中误差	See ERROR.	其平方等于各误差的平方和除以误差个数的值。
	mean sun	平太阳	See SUN.	沿天球赤道向东运动的假太阳。其速率提供了一种与平均视时间相等的均匀时间计量，用作为推算平时、�... more 沿天球赤道向东运动的假太阳。其速率提供了一种与平均视时间相等的均匀时间计量，用作为推算平时、区时的参考。
	mean tide level	平均潮面	See HALF TIDE LEVEL.	参见half tide level（半潮面）。
	mean time	平时	See TIME: MEAN SOLAR.	参见mean solar time（平太阳时）。
	mean water level	平均水面	The average surface level of a body of water.	水体的平均水平面。
	measured distance	船速校验距离	A COURSE at SEA, whose ends are indicated by RANGES ashore, and whose length has been accurately measured for determining the SPEED of ves... more A COURSE at SEA, whose ends are indicated by RANGES ashore, and whose length has been accurately measured for determining the SPEED of vessels.	两端点由岸上叠标标明，长度已精确测量以测定船舶航速的海上航线。
	measured mile	船速校验线	A MEASURED DISTANCE of one NAUTICAL MILE.	1海里的船速校验距离。
	measurement	尺寸	The (detailed) dimensions of a physical quantity.	指物理量的（详细）量度。
	median line	中线	A line every point of which is equidistant from the nearest points on the baselines of two or more states between which it lies.	每一点至两国或多国间的基线最近点距离相等的线。
	median valley	中央裂谷	The axial DEPRESSION of the mid-oceanic RIDGE system. See RIFT.	洋中脊轴部的坳陷。参见rift（断裂）。
	medimarimeter	平均海面仪	An apparatus for recording the MEAN SEA LEVEL.	记录平均海面的仪器。
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