Chinese English

The force directed towards the centre of curvature which constrains a body to move in a curved PATH. Equal and opposite to the CENTRIFUGAL FORCE.

(U.S.A.). In PHOTOGRAMMETRY, an empirical value which expresses the vertical measuring capability of a given stereoscopic system; generally defined as the ratio of the flight height to the smallest CONTOUR INTERVAL accurately plottable. The C-factor is not a fixed constant but varies over a considerable RANGE, according to the elements and conditions of the photogrammetric system. In planning for AERIAL PHOTOGRAPHY, the C-factor is used to determine the flight height required for a specified CONTOUR INTERVAL, CAMERA, and instrument system.

美国术语。在摄影测量学中，表示某立体测量系统垂直测量能力的经验值，一般定义为航高与可精确绘制在图上的最小等高距之比。它不是一个固定常数，而随摄影测量系统的部件和条件变化，变化幅度相当大。在制定航摄计划时，要利用C因子按给定的等高距、摄影机和仪器系统确定航高。

A group of TRANSMITTERS broadcasting the same programme. In ELECTRONIC NAVIGATION, several related transmitting stations in geographic proximity (Decca chain, Loran chain, etc.). In DIGITAL data, a sequence of one or more line segments.

播发相同测量信息的一组发射机。在电子导航中，地理上邻近的几个相关联的发射台站（台卡电台链、罗兰链）。数字数据中，一系列的单一或多个线段。

A reversal of the direction of motion (rising or falling) of a TIDE. The expression is also sometimes applied to a reversal in the SET of a TIDAL CURRENT. Also called turn of the tide. See also STAND OF TIDE.

潮汐运动方向的转换（涨潮或落潮）。该术语有时候也表示潮汐流方向的转换。亦称作转潮。参见stand of tide（平潮，停潮）。

That part of a body of water (sometimes dredged) deep enough for NAVIGATION through an area otherwise not navigable. It is usually marked by a single or double line of BUOYS and sometimes by RANGES. The deepest part of a STREAM, BAY or STRAIT through which the main CURRENT flows. See also STRAIT.

某一水域中其深度足以保证安全航行的水体部分（有时为人工疏浚），除此之外均不适于航行。通常用一条或双条浮标线将其标出，有时还用叠标将其标出。 河流、海湾以及海峡中主流流经的最深部分。

A long, narrow, U-shaped or V-shaped shallow depression of the SEAFLOOR usually occurring on a gently sloping PLAIN or FAN. A continuously sloping, elongated DEPRESSION commonly found in CONES or ABYSSAL PLAINS and customarily bordered by levees on one or both sides.

As pertains to typography, a graphic symbol such as a letter of the alphabet, figure, punctuation mark or sign employed in recording language. In data processing, an element of a CODE set used for representing information.

用于语言记录的图形符号（如字母、数字、标点符号、标记）。 在数据处理中，用于表达信息的代码要素。

All particularities of a LIGHT, such as colour, PERIOD, group number, VISIBILITY, HEIGHT above SEA LEVEL and CHARACTER. Also calledlight characteristics. See also GROUP.

有关灯标的全部特征，如颜色、周期、连闪光次数、射程、海平面上高度和特征。也称作light characteristics（灯质）。亦可参见Group（群，联）。