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	Term	术语	Definition	定义
	light (or lighted) beacon	灯桩，灯标	See BEACON.	发出灯光的浮标。
	light beam	光束	A group of PENCILS of light, as those originating at the many points of an illuminated surface. A BEAM of parallel LIGHT RAYS is a special ... more A group of PENCILS of light, as those originating at the many points of an illuminated surface. A BEAM of parallel LIGHT RAYS is a special case in which each PENCIL is of such small cross-section that it may be regarded as a RAY.	由发光面上许多点发出的一组光束。一束平行光线是一个特例。平行光线中的每一光线均具有非常小的横�... more 由发光面上许多点发出的一组光束。一束平行光线是一个特例。平行光线中的每一光线均具有非常小的横截面，可以看作一条光线。
	light (or lighted) buoy	灯浮标	See BUOY.	一种装备灯的浮标，它具有便于在黑暗中发现和识别的明确灯质。参见characteristics of light(灯质)。
	light characteristics	灯质	See CHARACTERISTICS OF LIGHT.	参见characteristics of light(灯质)。
	lighted sound buoy	灯光音响浮标	See BUOY.	提供音响信号的灯浮标。
	light float	灯浮标（筒），灯标船	A boat-like structure used instead of a light buoy in waters where strong streams or currents are experienced, or when a greater elevation t... more A boat-like structure used instead of a light buoy in waters where strong streams or currents are experienced, or when a greater elevation than that of a light buoy is necessary.	一种船形机构，用在强流或水流丰富水域，或当需要比灯浮标高度更高的灯标时代替灯浮标。
	lighthouse	灯塔	A distinctive structure on or off a COAST exhibiting a major LIGHT designed to serve as an AID TO NAVIGATION.	位于岸上或离岸的一种安装有强灯光的独特结构，起助航作用。
	light list	航标表	See LIST OF LIGHTS.	参见list of lights(航标表)。
	lightning	闪电	Luminous manifestations accompanying a sudden electrical discharge which takes place from or inside a CLOUD or, less often, from high stru... more Luminous manifestations accompanying a sudden electrical discharge which takes place from or inside a CLOUD or, less often, from high structures on the GROUND or from MOUNTAINS.	伴随强烈放电的发光现象，它发生在云端，在较少情况下发生在地面上的高大建筑或高山。
	light pencil	光束，光椎	A bundle of LIGHT RAYS originating at, or directed to, a single point.	起源于一个单点或者指向一个单点的一组光线。
	light ray	光线	The geometrical concept of a single element of light propagated in a straight line and of infinitesimal cross-section; used in analyticall... more The geometrical concept of a single element of light propagated in a straight line and of infinitesimal cross-section; used in analytically tracing the path of light through an OPTICAL SYSTEM.	光的单个元素的几何概念，沿直线传播，横断面无穷小；通常用于分析跟踪光线在视觉系统中传播路径。
	light sector	光弧，导航灯扇面	A sector in which a navigational LIGHT is visible. See ARC OF VISIBILITY.	可以看到导航灯光的扇面。参见arc of visibility（可见弧）。
	lightship	灯船	A distinctively marked vessel anchored or moored at a charted point, to serve as an AID TO NAVIGATION. By night it displays a characteristic... more A distinctively marked vessel anchored or moored at a charted point, to serve as an AID TO NAVIGATION. By night it displays a characteristic LIGHT(S), and is usually equipped with other devices, such as a FOG SIGNAL, SUBMARINE SOUND SIGNAL, and RADIOBEACON, to assist NAVIGATION. Also called light vessel.	一种具有明显标志的船，锚泊或停泊在海图标定的点上，作为助航标志。在夜间，发出一定灯质的灯光，�... more 一种具有明显标志的船，锚泊或停泊在海图标定的点上，作为助航标志。在夜间，发出一定灯质的灯光，通常还装备有其它设备，如雾号，水声信号或无线电航标，用来辅助航行。也称为light vessel。
	light vessel	灯船	See LIGHTSHIP.	参见lightship（灯船）。
	light-year	光年	A unit of length equal to the distance light travels in one YEAR. This unit is used as a measure of stellar distance.	长度单位，等于光一年（在真空中沿直线）传播的距离。光年用来度量天体距离。
	Lighter Aboard Ship (LASH)	载驳货船	A cargo carrying system using specially built ships and lighters. Cargoes are loaded into LASH lighters which are towed to a LASH ship where... more A cargo carrying system using specially built ships and lighters. Cargoes are loaded into LASH lighters which are towed to a LASH ship where they are embarked. At their destination the LASH lighters are disembarked and towed away to their unloading berths. Special berths or anchorages are sometimes designated for LASH ships.	一种专门采用组合船或驳船的货物装载系统。货物装入驳船后将驳船直接装在大船上拖运，到达目的地后�... more 一种专门采用组合船或驳船的货物装载系统。货物装入驳船后将驳船直接装在大船上拖运，到达目的地后将驳船从大船上卸下，拖到卸船泊位。有时也为载驳货船指定专门的泊位或锚地。
	limb	度盘，边缘	The graduated curved part of an instrument for measuring angles, as that part of a MARINE SEXTANT carrying the altitude scale, or arc. The c... more The graduated curved part of an instrument for measuring angles, as that part of a MARINE SEXTANT carrying the altitude scale, or arc. The circular outer edge of a CELESTIAL BODY. The half with the greatest ALTITUDE is called the upper limb and the half with the least ALTITUDE, the lower limb.	测量角度仪器的刻度部分，如附有高度分划尺的航海六分仪的度盘或弧度盘。天体的圆形外缘。其包含最... more 测量角度仪器的刻度部分，如附有高度分划尺的航海六分仪的度盘或弧度盘。天体的圆形外缘。其包含最大高度的一半边界称之为上边缘，包含最小高度的一半边界称之为下边缘。
	limestone	石灰石	A ROCK which consists chiefly of calcium carbonate.	主要成分是碳酸钙的岩石。
	limnology	湖沼学	The scientific study of the biological, chemical, geographical, and physical features of fresh waters, especially of LAKES and PONDS.	研究淡水特别是湖泊和池沼的生物、化学、地理和物理性质的学科。
	linear light	线光	See LIGHT.	具有可察觉长度的发光信号，与点光相对。
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