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	Term	术语	Definition	定义
	lower transit	下中天	See MERIDIAN TRANSIT.	参见meridian transit（中天）。
	lowest astronomical tide	最低天文潮位	The lowest tide level which can be predicted to occur under average meteorological conditions and under any combination of astronomical co... more The lowest tide level which can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions.	在平均气象条件和任何组合的天文条件下，可以预报的最低潮位。
	lowest low water	最低低潮	An arbitrary LEVEL conforming to the lowest TIDE observed at a place, or somewhat lower.	与某处或略低的地方观测的最低潮相一致的任意水位。
	low frequency (LF)	低频	See FREQUENCY: RADIO.	（LF）。参见radio frequency（无线电频率）。
	lowland	低地，洼地	Low and relatively level LAND at a lower ELEVATION than adjoining districts.	比相邻地段低且相对平的地方。
	low oblique photograph	浅倾航空像片	See PHOTOGRAPH.	视地平不在视场之内的倾斜摄影像片。
	low tide	低潮	See LOW WATER.	参见low water（低潮）。
	low-tide elevation	低潮高地	A naturally formed area of land which is surrounded by and above water at low tide, but submerged at high tide.	自然形成的陆地，被水体包围并在低潮时露出水面，但在高潮时被淹没。
	low velocity layer	低速层	Any LAYER in which the VELOCITY of compressional wave propagation is lower than in the adjacent LAYERS. Such a LAYER can act as an efficient... more Any LAYER in which the VELOCITY of compressional wave propagation is lower than in the adjacent LAYERS. Such a LAYER can act as an efficient channel for the propagation of elastic WAVES for great distances.	压缩波传播速度低于相邻层的某水层。这种水层可作为弹性波传播很长距离的一种有效通道。
	low water (L.W.)	低潮	The lowest LEVEL reached at a place by the water surface in one OSCILLATION. Also called low tide.	（LW）。某地一次振荡中水面所达到的最低水位。也称为low tide（低潮）。
	low water: double	NULL	A LOW WATER consisting of two minima separated by a relatively small elevation. See TIDE: DOUBLE.	NULL
	low water full and change (L.W.F. and C.)	平均朔望低潮间隙	The average interval of time between the TRANSIT (upper or lower) of the full or new MOON and the next LOW WATER.	(L.W.F. and C.)。满月或新月中天（上或下）和下一个低潮之间的平均时间间隔。
	low water inequality	低潮不等	See DIURNAL INEQUALITY.	参见diurnal inequality（日潮不等）。
	low water interval	低潮间隙	See LUNITIDAL INTERVAL.	参见lunitidal interval（月潮间隙）。
	low water line	低潮线	See LOW WATER MARK.	参见lunitidal interval（月潮间隙）。
	low water lunitidal interval (L.W.I)	（月潮）低潮间隙	Low water interval. See LUNITIDAL INTERVAL.	低潮间隙。参见lunitidal interval（月潮间隙）。
	low water mark	低潮水位标志，低潮线	The intersection of the plane of LOW WATER with the SHORE. The line along a COAST, or BEACH, to which the SEA recedes at LOW WATER. Also ca... more The intersection of the plane of LOW WATER with the SHORE. The line along a COAST, or BEACH, to which the SEA recedes at LOW WATER. Also called low water line.	低潮位与海岸的相交线。该线沿海岸或海滨，在低潮时海水退至低潮线。也称low water line。
	low water quadrature (L.W.Q.)	平均上下弦低潮间隙	The average low water interval when the MOON is at QUADRATURE.	(L.W.Q.)。当月球处于上下弦时的平均低潮间隙。
	low water stand	低潮停潮	See STAND OF TIDE.	参见stand of tide（停潮）。
	loxodrome	等角航线，恒向线	A curve, on the surface of a sphere, intersecting all GREAT CIRCLES of the sphere at a constant oblique angle, theoretically never reaching... more A curve, on the surface of a sphere, intersecting all GREAT CIRCLES of the sphere at a constant oblique angle, theoretically never reaching the POLE while closely approaching it. See RHUMB LINE.	球面上的曲线，与球面所有的大圆呈等斜角相交，理论上它可以非常接近两极，但不达到极点。参见rhumb line（等角航线）。
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