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	Term	术语	Definition	定义
	base map	基本地图，底图	See MAP.	显示可靠基本资料的地图。可用作编制专题性附加资料的底图。亦指包含所有资料的地图，根据这些资料能绘制显示专门信息的专题地图；亦指原始资料图。
	base net	基线网	See BASE EXTENSION TRIANGULATION.	参见base extension triangulation（基线扩展三角网）。
	basepoint	基点	A basepoint is any point on a baseline.	基线上的任何点。
	base tape (or wire)	基线尺	A tape or wire of metal or alloy, so designed and graduated that it is suitable for measuring the lengths of BASES. See also TAPE: INVAR, TA... more A tape or wire of metal or alloy, so designed and graduated that it is suitable for measuring the lengths of BASES. See also TAPE: INVAR, TAPE: STEEL and WIRE: INVAR.	用金属或合金材料制成的一种卷尺或钢尺，其设计和刻度适用测量基线的长度。参见invar tape（殷钢卷尺）、steel tape （钢卷尺）和invar wire（殷钢线尺）。
	base terminals	基线终端	The two extremes of a BASE LINE. Usually marked on a MONUMENT or metal stake buried beneath a visible SURFACE MARK. See also REFERENCE MARK.	基线的两个端点。通常要在端点设置标石或在可见地面标下埋设金属标桩。亦可参见reference mark（参考标记）。
	base tilt	基线倾斜	See TILT.	摄影学中空中基线相对水平线的倾角。
	basic control	基本控制	See CONTROL.	参见control（控制）。
	basic survey	基本测量	A hydrographic survey so complete and thorough that it does not need to be supplemented by other surveys, and is adequate to supersede, for ... more A hydrographic survey so complete and thorough that it does not need to be supplemented by other surveys, and is adequate to supersede, for charting purposes, all prior hydrographic surveys of the area.	一种不再需要其他测量进行补充的、足够完整和充分的海道测量。对于海图制图来说可以完全替代这一地区所有先前测量数据。
	basin	海盆	A DEPRESSION of the SEAFLOOR more or less equidimensional in plan and of variable extent.	海底的凹陷，形状大小不一，范围易变。
	basin: tidal	潮汐港，有潮港池	A BASIN affected by tidal forces in which water can be kept at a desired LEVEL by means of a gate.	指受潮汐影响的港池，尤指能用水闸保持理想水位的港池。
	bathymeter	测深仪	An instrument primarily designed for measuring DEPTH of water.	专门设计用于水深测量的仪器。
	bathymetric	（海洋）深测学的	(adj.). Of or pertaining to BATHYMETRY.	测深的或关于测深的。
	bathymetric chart	水深图	See CHART.	水底或部分水底地形的海图。水深图通常采用等深线和等深分层设色表示水深。
	bathymetric map	海底地形图	A topographic map of the ocean floor, or the bed of a lake. A topographic chart of the bed of a body of water, or a part of it. Generally, b... more A topographic map of the ocean floor, or the bed of a lake. A topographic chart of the bed of a body of water, or a part of it. Generally, bathymetric maps show depths by contour lines and gradient tints.	海底或湖底的地形图。水底或水域一部分的地形图。水深图通常采用等深线和分层设色表示。
	bathymetry	测深学，海底地形测量，水深测量	The determination of ocean depths. The general configuration of SEAFLOOR as determined by profile analysis of depth data.	海洋深度的测定。通过深度数据的剖面分析确定海底总体结构。
	bathyscaphe (or bathyscaph)	深海潜水器（深海潜艇）	A free, manned vehicle for exploring the deep OCEAN.	用于深海调查的独立载人潜器。
	bathysphere	探海球，潜水球	A diving sphere for deep-sea observations.	用于深海调查的潜水球。
	bathythermogram	深海温度记录图	The record of temperature versus DEPTH made by a BATHYTHERMOGRAPH. Rarely used.	通过深温仪测得的不同深度的温度记录。已经很少使用。
	bathythermograph	深温仪	A device for obtaining a record of temperature against DEPTH in the OCEAN, from a ship underway.	在船舶航行中，用于获取海洋不同深度水温的仪器。
	bay	海湾	A wide INDENTATION in the COASTLINE generally smaller than a GULF and larger than a COVE. For the purposes of the United Nations Conventio... more A wide INDENTATION in the COASTLINE generally smaller than a GULF and larger than a COVE. For the purposes of the United Nations Convention on the Law of the Sea, a bay is a well-marked indentation whose penetration is in such proportion to the width of its mouth as to contain land locked waters and constitute more than a mere curvature of the coast. See also HISTORIC BAY.	海岸线凹入的宽阔水域，一般比Gulf（海湾）小，比Cove（小湾）大。联合国海洋法公约规定，海湾是明显的海岸线凹入处，其凹入程度应与其入口处的宽度成比例，达到陆地环抱水域并构成大于海岸边界曲率的程度。亦可参见historic bay（历史海湾）。
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