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	Term	术语	Definition	定义
	mouse	鼠标	In computer systems, a pointing device operated by moving on a flat surface. See also CURSOR, JOYSTICK.	在计算机系统中，指通过平面上的移动而实现操作的指向装置。亦可参见cursor（光标），joystick（操纵杆）。
	mouth	河口，口	The place of discharge of a STREAM into the OCEAN or ENTRANCE to a BAY from the OCEAN.	河流流入海洋的地方或海洋通向海湾的进口处。
	mud	泥	Pelagic or terrigenous detrital material consisting mostly of silt and clay-sized particles (less than 0.06 millimetre) but often containin... more Pelagic or terrigenous detrital material consisting mostly of silt and clay-sized particles (less than 0.06 millimetre) but often containing varying amount of SAND and/or organic materials. It is a general term applied to any sticky fine-grained SEDIMENT whose exact size classification has not been determined.	远海或陆地的碎屑物质，主要由淤泥和粘土颗粒（小于0.06毫米）组成，但常含有不同数量的沙和（或）有机物质。任何确切尺寸分类还未确定的粘性细颗粒沉积物的通用术语。
	mud: red	红泥	A reddish-brown terrigenous deep-sea MUD which accumulates on the SEAFLOOR in the neighbourhood of deserts and off the MOUTHS of great RIV... more A reddish-brown terrigenous deep-sea MUD which accumulates on the SEAFLOOR in the neighbourhood of deserts and off the MOUTHS of great RIVERS; contains calcium carbonate up to 25 per cent.	一种堆积在沙漠附近和大河口外海床上的来自陆地的红褐色深海泥；含有多达25%的碳酸钙。
	mud snapper	采泥器	See SNAPPER.	固定在测深锤底部钻孔内的小型抓斗采样器。
	multi-beam echo sounder	多波束测深仪	A type of SWATH(E) SOUNDING SYSTEM in which the equipment emits a timed PULSE of sound that is narrow in the fore-aft direction and wide in... more A type of SWATH(E) SOUNDING SYSTEM in which the equipment emits a timed PULSE of sound that is narrow in the fore-aft direction and wide in the across track direction. The reflected sound is received by several RECEIVERs arranged as an ARRAY. By use of SIGNAL processing of the SIGNAL received at combinations of the RECEIVERS a much larger number, potentially many hundreds, of ACOUSTIC receive BEAM angles are formed. For each receive BEAM the time interval between emission and reception of the reflected sound is converted into a RANGE. Geometry is then used to convert each RANGE and receive BEAM angle to DEPTHs and also to position these DEPTHs within the SWATH(E) on the SEAFLOOR. MBES systems may also be referred to as beam-formers.	参见Multi Beam Echo Sounder（多波束测深仪）。
	multiple echo(es)	多重回波	See ECHO.	在回波测深中，继首次回波后所收到的其他回波，源自声波在海底与海面间的多重反射。这些反射通常会显示在普通指示器的度盘或曲线记录器的回波图上，有时会把这种回波误认为是首次回波。
	multiple lens camera	多镜头摄影机	See CAMERA.	有两个或两个以上光轴按固定角度系统化安置的镜头，能够在所有暗箱内同时曝光以拍摄广阔范围的摄影机。
	multiple lens photograph	多镜头像片	See PHOTOGRAPH.	用多镜头摄影机拍摄的像片。
	multiple sea sampler	多筒采水器	An instrument which comprises six WATER BOTTLES arranged so that they trip and take WATER SAMPLES at different selected DEPTHS from a vessel... more An instrument which comprises six WATER BOTTLES arranged so that they trip and take WATER SAMPLES at different selected DEPTHS from a vessel under way.	由6个采水器配置而成的仪器，可于行船上采集多个指定深度的水样。
	multiple tide staff	水尺组	See TIDE STAFF.	一连串放置于斜坡海岸上的水尺，其上的垂直刻度组成了以同一基准面为参照的连续标度。
	multiplex	多倍投影测图仪	In PHOTOGRAMMETRY, an instrument for making a TOPOGRAPHIC MAP from AERIAL PHOTOGRAPHS. A three-dimensional optical model of the TERRAIN to... more In PHOTOGRAMMETRY, an instrument for making a TOPOGRAPHIC MAP from AERIAL PHOTOGRAPHS. A three-dimensional optical model of the TERRAIN to be mapped is produced, in miniature, by direct optical PROJECTION from a pair of overlapping PHOTOGRAPHS. This instrument uses the ANAGLYPH principle.	在摄影测量学中，指根据航摄像片制作地形图的仪器。该仪器利用互补色原理，通过对一组重叠像片的直接光学投影，制成地形图的小型光学立体模型。
	multispectral imagery	多光谱图像	Images obtained simultaneously in a number of discrete bands in the electromagnetic spectrum.	同时利用多个离散的电磁频谱段获得的影像。
	multispectral scanner	多光谱扫描仪	A remote-sensing device which is capable of recording data in the ultraviolet and visible portions of the electromagnetic spectrum, as well... more A remote-sensing device which is capable of recording data in the ultraviolet and visible portions of the electromagnetic spectrum, as well as the infrared.	能够记录紫外线、电磁波谱可见光部分以及红外线的遥感装置。
	nadir	天底	That point on the CELESTIAL SPHERE directly beneath the observer, and directly opposite to the ZENITH.	在观测者正下方的天球上的点，与Zenith（天顶）相对。
	nadir: ground	地面天底点，地底点	The point on the GROUND vertically beneath the PERSPECTIVE CENTRE of the camera lens.	摄（像）影透镜中心正下方垂直于地面上的点。
	nadir: map	图幅天底点	The map position for the GROUND NADIR.	地面天底点在地图上所处的位置。
	nadir: photograph	像底点	In PHOTOGRAMMETRY, the point at which a vertical line through the PERSPECTIVE CENTRE of the camera lens pierces the plane of the PHOTOGRAPH.... more In PHOTOGRAMMETRY, the point at which a vertical line through the PERSPECTIVE CENTRE of the camera lens pierces the plane of the PHOTOGRAPH. Also called nadir point,or plumb point.	在摄影测量学中，指铅垂线通过照相机透镜的透视中心穿向像片平面的那一点。亦称nadir point（天底点）或plumb point（像底点）。
	nadir point	天底点	See NADIR: PHOTOGRAPH.	参见photograph nadir（像底点）。
	nadir radial	底点辐射线	See RADIAL.	自天底点发出的射线。参见photograph nadir（像底点）。
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