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long range navigation | 远程无线电导航系统
| See NAVIGATION. | 只在远距离航行时使用的导航系统，不能覆盖全球。相对的词是short range navigation（近程无线电导航系统）... more |
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longshore current | 沿岸流
| A current paralleling the shore largely within the surf zone. It is caused by the excess water brought to the zone by the small net mass tra... more | 在碎浪带内大规模的与岸平行的水流。这是由于风浪小规模的水体转移，将过量的水带至该区域而形成的... more |
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lookout station | 瞭望台
| A distinctive structure or place on SHORE from which personnel keep watch upon events at SEA or along the COAST. | 海岸上一种突出的建筑或场地，从瞭望台值班人员守望海上或沿岸活动。 |
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lookout tower | 瞭望塔
| Any tower surmounted by a small house in which a watch is habitually kept, as distinguished from an OBSERVATION TOWER in which no watch is... more | 小屋顶上建造的塔，在塔中可保持经常性观察，与 observation tower （观测塔）的区别是 observation tower 不进行... more |
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loom | 昏光，首次出现
| The glow of a light which is below the HORIZON, caused by REFLECTION by solid particles in the air. Vague first appearance of LAND at SEA. | 在空气中，经过固体颗粒反射而在地平线以下发出的光。
在海上首次出现的不清晰的陆地。 |
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looming | 上现蜃景，朦胧出现
| An apparent ELEVATION of distant terrestrial objects by abnormal ATMOSPHERIC REFRACTION. Because of looming, objects below the HORIZON are... more | 由于不正常的大气折射出现的地面较远处物体影像。因为是上现蜃景，因此物体低于地平线时仍能看到。... more |
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loop | 回路，环路；波腹，腹点
| In OCEANOGRAPHY, that part of a STANDING WAVE where the vertical motion is greatest and the horizontal VELOCITIES are least. Loops (someti... more | 在海洋学中，驻波的一部分，其垂直运动最大而水平运动为最小。
波腹（有时亦称为腹点）是与海港或海... more |
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loop antenna | 环状天线
| A DIRECTIONAL ANTENNA consisting essentially of one or more complete turns of wire. | 一种方向性天线，主要由一个或以上的金属丝线圈组成。 |
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lost' station | 不可恢复站，丢失站 | See STATION: UNRECOVERABLE. | 参见unrecoverable station（不可恢复站）。 |
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lough | 湖，狭长海湾
| Irish equivalent of the Scottish LOCH. | 爱尔兰语，与苏格兰的loch（湖）等同。 |
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louver shutter | 隔栅快门，百叶窗式快门
| See SHUTTER. | 由数个薄金属条或格栅组成的快门，以操纵百叶窗方式曝光。一般位于紧挨透镜的前部或后部。 |
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love wave (or Q-wave) | 勒夫波
| See WAVE. | 沿具有刚性的两种弹性介质的边界传播的横波，即两种介质都必须能传播横波。
表面地震波，其中弹... more |
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low | 洼地，低地；低气压
| See DEPRESSION. | 参见depression（低地；低气压）。 |
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lower branch | 下（半）子午圈
| That half of a MERIDIAN or CELESTIAL MERIDIAN from POLE to POLE which passes through the ANTIPODE or NADIR of a place. | 子午圈的一半或两极点间子午圈，经过某地的对极或天底点。 |
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lower culmination | 下中天
| See MERIDIAN TRANSIT. | 参见meridian transit（中天）。 |
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lower high water (L.H.W.) | 低高潮 | The lower of two HIGH WATERS occurring during a TIDAL DAY if the DIURNAL INEQUALITY prevails. | (L.H.W.)。日潮不等盛行时在某一潮汐日期间两个高潮中的较低者。 |
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lower high water interval | 低高潮间隙
| See LUNITIDAL INTERVAL. | 参见lunitidal interval（月潮间隙）。 |
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lower limb | 下边缘
| See LIMB. | 参见limb（边缘）。 |
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lower low water (L.L.W.) | 低低潮 | The lower of two LOW WATERS occurring during a TIDAL DAY if the DIURNAL INEQUALITY prevails. | (L.L.W.)。日潮不等盛行时在某一潮汐日期间两个低潮中的较低者。 |
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lower low water interval | 低低潮间隙
| See LUNITIDAL INTERVAL. | 参见lunitidal interval（月潮间隙）。 |