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	Term	术语	Definition	定义
	semidiurnal tide	半日潮	See TIDE.	其潮汐周期为每个潮汐日有两个高潮和两个低潮的潮汐，其日潮不等相对较小。
	semi-enclosed sea	半封闭式海域	See ENCLOSED SEA.	一个海湾、港池或由两个或两个以上国家所环绕,并连接到另一个海或海洋的海域。
	semimajor axis	长半轴	One-half of the longest diameter of an ellipse.	椭圆最长轴的一半。
	semiminor axis	短半轴	One-half of the shortest diameter of an ellipse.	椭圆最短轴的一半。
	send	NULL	See SCEND.	NULL
	sensibility of magnetic compass	磁罗经灵敏性	The ability of a magnetic compass card to align itself with the MAGNETIC MERIDIAN after deflection.	磁罗经标度板在磁针偏斜之后，对准磁子午线的能力。
	sensibility (or sensitivity) of spirit level	水准仪灵敏度	The ACCURACY and PRECISION which a SPIRIT LEVEL is capable of producing. Sensibility depends on the radius of curvature of its longitudinal ... more The ACCURACY and PRECISION which a SPIRIT LEVEL is capable of producing. Sensibility depends on the radius of curvature of its longitudinal section; the longer the radius, the more sensitive the level.	气泡水准器所具有的准确性和精密度。其灵敏度高低取决于水准器纵向剖面曲率半径的大小，半径越长则�... more 气泡水准器所具有的准确性和精密度。其灵敏度高低取决于水准器纵向剖面曲率半径的大小，半径越长则灵敏度越高。
	sensible horizon	可见地平	See HORIZON.	过任一点（如观测者的眼睛），并垂直于天顶/天底线的平面与天球相截而形成的大圈。
	sensitive bubble	灵敏水准器，灵敏气泡	See LEVEL: SPIRIT.	一种小型密封的容器（玻璃管），其内部表面上部是弯曲的，容器填充了低粘度的液体（酒精或乙醚），�... more 一种小型密封的容器（玻璃管），其内部表面上部是弯曲的，容器填充了低粘度的液体（酒精或乙醚），在容器顶部的位置上保留了足够形成气泡的自由空间，应用于测量方面有两种类型的水准器，一种是球形曲面，产生圆形气泡，称为圆水准器（也称通用水准器或气泡圆水准器）。另一种是大多数情况下使用的类型，容器是一圆形管，其纵向轴也呈圆形。日常所称“水准器”即指这一类型。水准器亦称水准气泡或灵敏气泡。
	sensitivity of electronic equipment	电子仪器灵敏度	The ability of electronic equipment to amplify a SIGNAL, measured by the minimum strength of signal INPUT capable of causing a desired val... more The ability of electronic equipment to amplify a SIGNAL, measured by the minimum strength of signal INPUT capable of causing a desired value of OUTPUT. The lower the INPUT signal for a given OUTPUT, the higher the sensitivity.	电子仪器放大信号的能力，衡量该能力的标准是：输入一个最小强度的信号，能够产生所期望的输出，对�... more 电子仪器放大信号的能力，衡量该能力的标准是：输入一个最小强度的信号，能够产生所期望的输出，对于确定的输出，输入信号越低，灵敏度越高。
	sensitivity of spirit level	水准仪灵敏度	See SENSIBILITY OF SPIRIT LEVEL.	气泡水准器所具有的准确性和精密度。其灵敏度高低取决于水准器纵向剖面曲率半径的大小，半径越长则�... more 气泡水准器所具有的准确性和精密度。其灵敏度高低取决于水准器纵向剖面曲率半径的大小，半径越长则灵敏度越高。
	separation effect	分隔效应	In ECHO SOUNDING instruments with separate transmitting and receiving units, the effect caused by such separation. This introduces an ERROR ... more In ECHO SOUNDING instruments with separate transmitting and receiving units, the effect caused by such separation. This introduces an ERROR depending on the distance between the acoustic units and varying with the DEPTH of water. Such ERROR makes the registered DEPTH greater than the actual DEPTH. Separation also causes a LAG in registration of the transmitted SIGNAL.	回声测深仪的发射和接收装置是分离装配的，这种分离产生的结果称为分隔效应。这种效应引起的误差因�... more 回声测深仪的发射和接收装置是分离装配的，这种分离产生的结果称为分隔效应。这种效应引起的误差因装置间的距离及测量深度的变化而不同，一般会使记录深度大于实际水深。这种分离也会引起发射信号记录的滞后。
	separation line	分隔线	See SEPARATION ZONE.	为分道通航目的而划定的带或线，用于分隔对遇或近似对遇方向的船舶；或从邻接海域划分出一条通航分�... more 为分道通航目的而划定的带或线，用于分隔对遇或近似对遇方向的船舶；或从邻接海域划分出一条通航分道；或为同方向行进船舶按不同级别划分出通航分道。
	separation zone or line	分隔带	A zone or line separating the traffic LANES in which ships are proceeding in opposite, or nearly opposite directions; or separating a traffi... more A zone or line separating the traffic LANES in which ships are proceeding in opposite, or nearly opposite directions; or separating a traffic lane from the adjacent sea area; or separating traffic lanes designated for particular classes of ships proceeding in the same direction.	为分道通航目的而划定的带或线，用于分隔对遇或近似对遇方向的船舶；或从邻接海域划分出一条通航分�... more 为分道通航目的而划定的带或线，用于分隔对遇或近似对遇方向的船舶；或从邻接海域划分出一条通航分道；或为同方向行进船舶按不同级别划分出通航分道。
	sequence of current	潮流序列	The order of occurrence of the TIDAL CURRENT strengths of a day, with special reference to whether the greater FLOOD immediately precede... more The order of occurrence of the TIDAL CURRENT strengths of a day, with special reference to whether the greater FLOOD immediately precedes or follows the greater EBB.	一日之内潮流强度发生的次序，其顺序与大潮涨潮流发生在大潮落潮流之前还是之后有关。
	sequence of tide	潮汐序列	The order in which the TIDES of a day occur, with special reference to whether the HIGHER HIGH WATER immediately precedes or follows the LOW... more The order in which the TIDES of a day occur, with special reference to whether the HIGHER HIGH WATER immediately precedes or follows the LOWER LOW WATER.	一日之内潮汐发生的次序，其顺序与高高潮发生在低低潮之前还是之后有关。
	serial temperatures	系列温盐观测	The OBSERVATIONS required to determine the vertical distribution of temperature and SALINITY with DEPTH at any one place in the OCEAN.	在海洋任一地点，确定不同深度的温度和盐度垂直分布所需要的观测。
	set	日落；下降；设置	The direction toward which a CURRENT flows.	天体下落时越过视地平；与上升相对；设立，比如设置航道。
	set	日落；下降；设置	(v.i.). Of a CELESTIAL BODY, to cross the APPARENT HORIZON while descending. The opposite is RISE. To establish, as to set a COURSE.	天体下落时越过视地平；与上升相对；设立，比如设置航道。
	set of observations	测回	A set of two or more OBSERVATIONS at different settings of the apparatus made in order to eliminate certain ERRORS which, for the apparatus ... more A set of two or more OBSERVATIONS at different settings of the apparatus made in order to eliminate certain ERRORS which, for the apparatus concerned, are inherent in a single OBSERVATION.	以所用仪器的不同设置方式进行两次或两次以上的一组观测称之为一个测回，其目的是消除仪器在单次测�... more 以所用仪器的不同设置方式进行两次或两次以上的一组观测称之为一个测回，其目的是消除仪器在单次测量中的内在误差。
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