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saddle | 鞍部，山口，海山鞍部 | A broad PASS or COL, resembling in shape a riding saddle in a RIDGE or between contiguous ELEVATIONS. | 山坳、隘口或任何马鞍状地形。
海脊上或海山之间的低凹部分。 |
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safety aids | 助航设备 | See AID TO NAVIGATION. | 参见aids to navigation（助航标志）。 |
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safety fairway | 安全航道 | An area within which permits are not granted for the erection of oil or gas related structures. The use of a safety fairway is not usually... more | 在其范围内不允许建设与油、气有关的建筑的区域。安全航道一般不强制使用，只是建议使用。 |
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safety zone | 安全区 | The area around an offshore installation within which vessels are prohibited from entering without permission. Special regulations protect i... more | 近海设施周围的水域，船只未经许可禁止进入。在安全区内有专门规定的防护设施，所有国际的船只均应... more |
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SafetyNET | 国际SafetyNET服务
| The international service for the broadcast and automatic reception of MARITIME SAFETY INFORMATION via the INMARSAT EGC system in waters whe... more | 在NAVTEX服务未覆盖的区域，通过INMARSAT EGC系统播发和自动接收海上安全信息的国际服务。 |
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safe water mark | 安全标志 | In the IALA Maritime Buoyage System a NAVIGATION MARK used to indicate that there is NAVIGABLE WATER around its POSITION with no known haza... more | 在国际航标协会（IALA）海上浮标系统中，指示其周围有可航水域且附近没有已知碍航物的安全标志。 |
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sag correction (tape) | NULL | See TAPE: SAG CORRECTION. | NULL |
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sailing | 航法 | A method of solving the various problems involving COURSE, distance, DIFFERENCE OF LATITUDE, DIFFERENCE OF LONGITUDE and DEPARTURE. The ... more | 解决诸如航道、距离、维差、经差、横距等一系列问题的方法，这些不同的方法统称为航法。 |
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sailing: composite | 组合航法 | A modification of GREAT-CIRCLE SAILING used when it is desired to limit the highest LATITUDE. | 为满足高纬地区的航行而对大圆航法改进得到的航法。 |
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sailing: great circle | NULL | Any SAILING when a GREAT CIRCLE TRACK is involved. | NULL |
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sailing: Mercator | 墨卡托航法
| A mathematical solution of the plot as made on a MERCATOR CHART. It is similar to PLANE SAILING, but uses MERIDIONAL DIFFERENCE and DIFFER... more | 在墨卡托海图上标绘航线的一种数学方法。这种航行类似于平面航法，但在纬差和东西距不同的地点需分... more |
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sailing: meridian | 子午线航法
| Following a TRUE COURSE of 0° or 180°; SAILING along a MERIDIAN. | 真航向为0°或180°，即沿某一经线航行。 |
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sailing: middle-latitude | 中分纬度航法
| A method of converting DEPARTURE into DIFFERENCE OF LONGITUDE, or vice versa, when the true COURSE is not 90° or 270°, by assuming that ... more | 当真航向不是90°或270°时，假定在中分纬度处调整航向，将东西距转换为经差（或反向转换）的一种航法... more |
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sailing: parallel | 等纬线航行；平行航法
| A method of converting DEPARTURE into DIFFERENCE OF LONGITUDE, or vice versa, when the true COURSE is 90° or 270°. | 当真航向为90°或270°时，将东西距转换为经差（或反向转换）的一种方法。 |
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sailing: plane | 平面航法 | A SAILING in which the EARTH or a small part of it is considered a plane. | 将地球表面或某一区域视为平面的一种航行方法。 |
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sailing: rhumb line | NULL | Any SAILING when a RHUMB LINE is involved. | NULL |
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sailing: spherical | 球面航法 | Any of the SAILINGS which consider the spherical or spheroidal shape of the EARTH. | 任何将地球视为球体或椭球体而进行航行的方法。 |
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sailing: traverse | 分段航法 | A method of determining the equivalent COURSE and distance made good by a craft following a TRACK consisting of a series of RHUMB LINES.... more | 船舶通过一系列分段等角航线航行时，确定最终等值航向与航程的方法。该问题的解决方法一般采用平面... more |
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sailing chart | 航行图 | See under CHART. | 用于近海航行的小比例尺海图。 |
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sailing directions | 航路指南 | Information published in book form describing COASTS, waters, CHANNELS, harbour facilities, etc., for use by mariners. | 以书本形式出版的描述海岸、水域、航道、港口设备等的资料，供航海人员使用。 |