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Term | 术语 | Definition | 定义 |
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vertical parallax | 纵视差
| See PARALLAX: Y-. | 参见Y- PARALLAX（上下视差）。 |
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vertical photograph | 垂直航摄像片
| See PHOTOGRAPH. | 摄影光轴垂直（或在飞机上尽量保持垂直）时所拍摄的航空像片。 |
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vertical plane | 铅垂面，垂直面
| See PLANE. | 通过地球某一点并包含该点天顶和天底的任何平面。 |
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very close pack ice | 甚密浮冰群
| SEA ICE the CONCENTRATION of which is practically 10/10ths with little if any water present. | 覆盖面积几乎为10/10的海冰，有水出现也是少量的。 |
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very high frequency (VHF) | 甚高频
| See FREQUENCY: RADIO. | 无线电通讯中，电磁波的有效辐射频率。无线电频率通常分为：甚低频（30千赫以内）、低频（30-300千赫）... more |
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very low frequency (VLF) | 甚低频
| See FREQUENCY: RADIO. | 无线电通讯中，电磁波的有效辐射频率。无线电频率通常分为：甚低频（30千赫以内）、低频（30-300千赫）... more |
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very open pack ice | 甚稀疏流冰群
| SEA ICE the CONCENTRATION of which ranges between 1/10ths 3/10ths. | 覆盖面积在1/10—3/10范围内的海冰。 |
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vessel traffic service (VTS) | 船舶交通服务
| Any service implemented by a relevant authority primarily designed to improve safety and efficiency of traffic flow and the protection of ... more | VTS由有关机构提供的任何服务，主要目的是提高交通安全与效率，以及保护生态环境。这类服务的范围从... more |
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viaduct | 高架桥，跨线桥，立交桥
| A structure consisting of a series of arches or towers supporting a roadway, waterway, etc., across a depression, etc. | 由一系列支撑公路、水路的拱桥和塔架构成，用于跨越低凹地的结构。 |
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vibrating needle | 摆动磁针仪
| A MAGNETIC NEEDLE used in compass adjustment to find the relative intensity of the horizontal components of the EARTH'S MAGNETIC FIELD and t... more | 一种罗经用调整磁针，用于测量罗经所在位置地磁场和磁场水平分量的相对强度。亦称水平磁力仪。 |
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vibration | 振动
| Periodic motion of an elastic body or medium in alternately opposite directions from EQUILIBRIUM; OSCILLATION. The motion of a vibrating b... more | 弹性体或介质由平衡位置向相反方向交替摆动的周期运动，即振荡。振动物体在一周期内的运动，为两次... more |
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vigia | 疑位（存）浅滩（暗礁），（海图）警告事项
| A PINNACLE, ROCK, or SHOAL the existence or POSITION of which is doubtful, or a warning note to this effect on a CHART. | 海底尖礁、岩石或暗礁的存在或位置有疑问；或这种现象在海图上的示警内容。 |
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vignetting | 渐晕，遮光
| In PHOTOGRAPHY, a gradual reduction in DENSITY of parts of a photographic IMAGE due to the stopping of some of the RAYS entering the LENS. | 摄影中，由于进入透镜的一些光线受阻，致使像片成像密度逐渐减小。 |
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violent storm | 暴风
| WIND with a speed between 56 and 63 KNOTS (Beaufort scale wind force 11). | 速度在56至63节之间的风（蒲福11级风） |
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virtual image | 虚像
| See IMAGE. | 不能显示在表面上，但可以看见的影像，如同在镜子中一样。 |
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visibility | 视界，能见度
| The extreme horizontal distance at which prominent objects can be seen and identified by the unaided eye. | 用肉眼能够显著看见和识别的目标最远水平距离。 |
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visibility: flight | 飞行能见度
| The VISIBILITY forward from the cockpit of an aircraft in flight. | 从飞行中飞机驾驶员座舱向前看的可见距离。 |
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visibility: meteorological | 气象能见度
| The greatest distance at which a black object of suitable dimensions can be seen and recognized against the horizon sky, or, in the case of ... more | 大小合适的黑色目标物能够从天空背景中被看到和识别的最大距离，或在夜间观测中，当总体照明达到正... more |
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visibility: radius of | NULL | The radius of a circle limiting the area in which an object can be seen under specified conditions. | NULL |
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visible horizon | 视地平，可见地平线 | See HORIZON: APPARENT. | 由观测点发出的与地球相切的视线所构成的地平线。亦称visible (or local) horizon。 |