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	Term	术语	Definition	定义
	delineation	描绘；清绘；勾绘	In CARTOGRAPHY, the visual selection and distinguishing of mapworthy features on various possible source materials by outlining the features... more In CARTOGRAPHY, the visual selection and distinguishing of mapworthy features on various possible source materials by outlining the features on the source material, or on a map manuscript (as when operating a STEREOSCOPIC PLOTTING INSTRUMENT); also a preliminary step in COMPILATION.	在制图中，在原始资料或地图原图上（当操作一个立体测绘仪时），直观地选择并标出对制图有价值的要素。这是编图的初始步骤。
	delta	三角洲	An area of alluvial DEPOSIT, usually triangular in outline, near the MOUTH of a RIVER.	河口附近的冲积区，通常呈三角形。
	demagnetize	消磁	(v.t.). To remove MAGNETISM. The opposite is MAGNETIZE.	动词，去除磁性。反义词是magnetize（磁化）。
	densitometer	显像密度计	An electric instrument designed to accurately measure optical DENSITY or tone values and used in place of the human eye for such purposes.	一种可代替人眼进行光密度值或色调值测量的电子仪器。
	density	浓度，密度	In PHOTOGRAPHY, a measure of the degree of blackening of an exposed film, PLATE or paper after development, or the direct IMAGE (in the case... more In PHOTOGRAPHY, a measure of the degree of blackening of an exposed film, PLATE or paper after development, or the direct IMAGE (in the case of a print-out material). It is defined strictly as the logarithm of the optical OPACITY. In OCEANOGRAPHY, density is equivalent to SPECIFIC GRAVITY and represents the ratio, at ATMOSPHERIC PRESSURE, of the WEIGHT of a given volume of SEA WATER to that of an equal volume of distilled water at 4.0°C.	1.在摄影学中，度量经过曝光、显影的胶卷、底片及相纸或者直接图像变黑程度的量，严格定义为阻光度的对数值。 2.在海洋学中，指海水的比重，表示为大气压力下给定体积海水重量与同体积的4.0°C蒸馏水重量的之比。
	density layer	密度层	A LAYER of water in which DENSITY increases with DEPTH enough to increase the BUOYANCY of a submarine.	随着深度增加，其密度量足以提高潜艇浮力的水层。
	density of soundings	测深密度	Intervals between LINES OF SOUNDING and SOUNDINGS in the same line. Density of soundings mostly depends on the SCALE and nature of the SURVE... more Intervals between LINES OF SOUNDING and SOUNDINGS in the same line. Density of soundings mostly depends on the SCALE and nature of the SURVEY. Also called frequency of soundings.	测深线与测深线之间和同一测深线水深点与水深点之间的间隔，主要取决于测量比例尺和性质。也称作 frequency of soundings（测深密度）。
	departure	横距，经差，东西距	The distance between two MERIDIANS at any given PARALLEL OF LATITUDE expressed in linear units, usually NAUTICAL MILES. The distance to the ... more The distance between two MERIDIANS at any given PARALLEL OF LATITUDE expressed in linear units, usually NAUTICAL MILES. The distance to the east or west made good by a vessel in proceeding from one point to another.	1.任意给定纬度平行圈上两条经线之间的距离，采用线性单位表示（通常是海里）。 2.一个点到另一个正东方或正西方的点的距离。
	departure: point of	起航点，出发点	The point from which the initial COURSE to reach the point of destination begins.	至目的地的初始航向的起点。
	deposit	沉积物	Accumulations of solid material (of any type or from any source) on the sea bottom which eventually may become compacted and consolidated an... more Accumulations of solid material (of any type or from any source) on the sea bottom which eventually may become compacted and consolidated and form sedimentary ROCK.	所有海底的固体物质（任何来源、任何类型），最终将被压实和固结，并形成沉积岩。
	depressed pole	俯极	See POLE.	在地平线下的天极，与纬度计量符号命名相反。
	depressor	压板	A device to maintain a towfish at a given depth.	将拖鱼保持在指定深度的设备。
	depression	深坑，洼地；低气压区，气旋	Any HOLLOW or relatively sunken area. In METEOROLOGY, a region of the ATMOSPHERE in which the pressure is low relative to the surrounding re... more Any HOLLOW or relatively sunken area. In METEOROLOGY, a region of the ATMOSPHERE in which the pressure is low relative to the surrounding region at the same level. It is represented on a WEATHER CHART by a system of ISOBARS at a specified level or of CONTOURS at a specified pressure which enclose relatively low values of pressure or level. Also calledlowor cyclone.	1.一个坑或一个相对凹陷的区域。 2.在气象学中，在同一高度比周围气压相对较低的区域。在天气图上，该区域采用指定高度的等压线，或相对封闭的低气压等压线表示。
	depression: angle of	NULL	See ANGLE OF DEPRESSION.	NULL
	depression contour	洼地等高线，负向地貌等高线	See CONTOUR.	一种闭合等高线，等高线内部高程比外面高程低。亦可参见form line（地形线）。
	depression of the horizon	地倾角	See DIP.	参见dip（倾角）。
	depth	深度	The vertical distance from a given water level to the BOTTOM.	指定水准面到海底的垂直距离。
	depth: charted	海图水深	The vertical distance from the CHART DATUM to the BOTTOM.	从海图基准到海底的垂直距离。
	depth: compensation	补偿深度	The DEPTH at which the light intensity is just sufficient to bring about a balance between the oxygen produced by ALGAE through PHOTOSYNTHES... more The DEPTH at which the light intensity is just sufficient to bring about a balance between the oxygen produced by ALGAE through PHOTOSYNTHESIS and that consumed by them through respiration.	在某深度，光强正好使得海藻光合作用产生的氧与呼吸作用消耗的氧保持平衡，这一深度称为补偿深度。
	depth: controlling	（航道的）限制水深，控制水深	The least DEPTH in the approach or CHANNEL to an area, such as a PORT or ANCHORAGE, governing the maximum DRAFT of vessels that can enter.	进入某区域（如港池或锚地）的最小水深，它决定着进入船舶的最大吃水。
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