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passage | 航道，通道
| A narrow navigable CHANNEL, especially one through REEFS or ISLANDS. Sometimes called a PASS, or in New England waters a HOLE. | 狭窄的通航水道，尤指通过暗礁或岛屿的水道。有时称作pass（通道），在新英格兰水域称作hole（通道）。 |
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passage: meridian | 中天
| See MERIDIAN TRANSIT. | 参见meridian transit（中天）。 |
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passive system | 被动系统，无源系统
| A system which records energy emitted or reflected but does not produce or transmit energy of its own. | 记录发射或反射能量但自身不产生或传递能量的系统。 |
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passometer | 计步器
| A pocket-size instrument which registers the number of steps taken by the pedestrian carrying it. See PEDOMETER. | 由步行者携带的可记录其步数的小型仪器。参见pedometer（步程计）。 |
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pass point | 控制点
| In PHOTOGRAMMETRY, a point whose horizontal and/or vertical position is determined from PHOTOGRAPHS by photogrammetrical methods and whic... more | 在摄影测量学中，指通过摄影测量方法从像片确定其水平或垂直位置的点，该点作为辅助控制点为其他像片定向。 |
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patch | 小块浮冰
| In ice terminology, a collection of PACK ICE, less than 10 km across. | 在有关冰的术语中，指直径小于10千米的流冰群。 |
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patent log | 拖曳式计程仪，专用计程仪
| See LOG. | 旧称towed log（拖曳式计程仪）。
机械计程仪，特指拖曳式计程仪。 |
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path | 路径，径迹，轨迹，行程
| A line of movement; course taken, as the path of a METEOR. A line connecting a series of points in space and constituting a proposed or trav... more | 运动路线；经过的轨迹，如流星轨迹。
空间中构成计划或已航航线的一系列点的连线。 |
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pattern | 格网
| See LATTICE. | 参见lattice（位置线格网）。 |
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P-code | 精码，P码
| The Precise (or Protected) GPS code; a very long (about 1014 bit) sequence of pseudo-random binary biphase modulations on the GPS carrier at... more | 全球定位系统（GPS）的精确码。GPS载波上的非常长（约1014比特）的二进制伪随机双相调制序列，其码速率为10．23兆赫，约267天循环一次。每颗全球定位系统卫星都有各自的一星期精码程序段，每周复位一次。参见C/A Code（C/A码）。 |
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peak | 山峰，尖端；最高点
| A prominent elevation either pointed or of very limited extent across the SUMMIT. Also called pike. | 顶点较尖或具有限面积的突起的高地。亦称pike（顶峰）。 |
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pebble | 卵石，砾石
| A small STONE worn smooth and rounded by the action of water, SAND, ICE, etc. ranging in diameter between 4 and 64 millimetres. | 由于水、沙、冰等作用而被磨光、磨圆的小石头，直径在4至64毫米之间。 |
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pecked line | 虚线
| In CARTOGRAPHY, a SYMBOL consisting of a line broken at regular intervals. | 在制图学中，指由按一定间隔断开的线所构成的符号。 |
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pedometer | 步程计
| A pocket-size instrument which registers in linear units the distance traversed by the pedestrian carrying it. See PASSOMETER. | 由步行者携带的通过线性装置记录走过距离的小型仪器。参见passometer（计步器）。 |
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pelagic-abyssal sediments | 远洋深海沉积物
| Deep sea SEDIMENTS that are free of terrestrial material except for a small proportion of very fine CLAY. | 除小部分细粘土外，不含其他地表物质的深海沉积物。 |
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pelagic division | 海洋部分，水层区
| In the classification of the marine environment and its inhabitants, a primary division of the SEA which includes the whole mass of water. T... more | 在海洋环境及其生物分类中，指包括整个水体的海的基本部分。该部分由200米以内水深的浅海区和200米以上水深的大洋区组成。另一基本部分是海底区。 |
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pelorus | 哑罗经，罗经刻度盘
| A COMPASS CARD in the form of a metal plate mounted in GIMBALS to maintain a horizontal position and fitted with SIGHT-VANES for observing B... more | 一种金属平板罗经刻度盘，安装在万向支架上以保持一定的水平位置。在不能直接通过罗盘进行定向的地方，可用它与瞄准器组合来观方位，亦称dumb compass（哑罗经）或bearing plate（方位分度器）。亦见alidade（照准部）。 |
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pencil | 光锥
| In optics, a set of RAYS coming to or spreading out from a point. See LIGHT PENCIL. | 在光学中，指从一点射出或汇聚于一点的光线束。参见light pencil（光束）。 |
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pencil beam | 锥形光束，锥形射束
| A BEAM in which the RADIANT ENERGY is concentrated in an approximately conical or cylindrical portion of space of relatively small diameter... more | 辐射能集中在直径很小的近似圆锥或圆柱形空间内的射束，多用于旋转型导航灯标。 |
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pendulum | （钟等的）摆，摆动锤；摆仪
| A body so suspended from a fixed point as to swing freely to and from under the combined forces of GRAVITY and MOMENTUM. A vertical bar so ... more | 悬挂在某一固定点上，在重力和动量的综合作用下自由地往复摆动的物体。
由牵引弹簧在下面支撑，在重力和弹簧回复力的共同作用下往复振动的竖杆。 |