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radio spectrum | 无线电频谱
| The RANGE of electromagnetic RADIATIONS useful for communication by RADIO (approximately 10 kilohertz to 300,000 MEGAHERTZ). | 用于无线电通讯的电磁波波段，一般10千赫～30万兆赫。 |
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radio stars | 射电星
| Sources of RADIO WAVES existing in the universe. The position of many of the radio stars have been plotted but their SIGNALS are generally v... more | 存在于宇宙的无线电波源，已测出许多射电星的位置，但他们的信号一般很微弱。 |
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radio station | 无线电台（站）
| A place equipped to transmit RADIO WAVES. Such a station may be either stationary or mobile, and may also be provided with a RADIO RECEIVER... more | 装备有无线电波发射设备的场所。这种台站有固定的、有活动的，也有台站装备无线电接收机。英国术语中亦称w/t station。 |
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radiotheodolite | 无线电经纬仪
| Electronic THEODOLITE designed to give the direction in space of a RADIO TRANSMITTER carried by a free balloon. | 测定自由气球携带的无线电发射机在空中方向的电子经纬仪。 |
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radio time signal | 无线电时间信号
| A TIME SIGNAL sent by RADIO. | 由无线电发送的时间信号。 |
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radio transmitter | 无线电发射机
| Equipment for generating radio signals. | 产生无线电信号的设备。 |
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radio wave(s) | 无线电波
| See WAVE. | 一种电磁频率波，通常其频率高于声波，低于热及光波。亦称 hertzian waves（赫兹波）。 |
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radius: cruising | NULL | See CRUISING RADIUS. | NULL |
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radius of visibility | 能见半径
| See under VISIBILITY. | 在特定条件下，用肉眼能够看到目标的最大圆形范围的半径。 |
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radius vector | 向径，矢径
| A straight line connecting a fixed REFERENCE POINT or centre with a second point, which may be moving. In ASTRONOMY, the expression is usual... more | 将一个固定参照点或中心点与第二个点（或许是动点）连接起来的直线。在天文学中，常指连结一天体与绕其转动的另一天体的直线，如地球和月亮的向径。参见plane polar coordinates（平面极坐标） 和polar coordinates（极坐标）。 |
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radome | （雷达）天线屏蔽器
| A dome, usually of glass reinforced plastic, housing a radar aerial. These domes are often prominent. The term is also used for domes or po... more | 罩在雷达天线上的圆顶，一般由玻璃纤维增强塑料制成。这些罩子是很显眼的。也指用于船只或飞机上遮盖类似设备的圆顶或吊舱。 |
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rafted ice | 筏冰，筏形冰
| Type of PRESSURE ICE formed by one FLOE overriding another. | 一层浮冰盖在另一层上的挤压过程，通常发生在新形成的冰之间。 |
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rafting | NULL | Pressure process whereby one piece of ICE overrides another. Most common in NEW and YOUNG ICE. | NULL |
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rain | 雨
| PRECIPITATION of liquid water particles in the form of drops of more than 0.5 mm diameter or of smaller widely scattered drops. | 直径大于0.5毫米或者直径更小但散布范围更广的液态水粒子急速坠落。 |
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rainbow | 彩虹
| Groups of concentric arcs with colours ranging from violet to red, produced on a "screen" of water drops (raindrops, droplets of DRIZZLE o... more | 降水（雨点、细雨或雾）后在大气中由于太阳光或月亮光照射而形成的一组由紫色渐变至红色的同心弧。 |
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rainfall amount | 降雨量
| Thickness of the layer of water which accumulates on a horizontal surface, as the result of one or more falls of PRECIPITATION, in the abse... more | 以水平面上积水层的厚度，计量一次或多次降水的结果。这种计量不考虑渗透或蒸发以及降水处任何部分的冰雪融化。亦称amount of precipitation。 |
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rain gauge | 雨量计
| See GAUGE. | 假定雨降落到一个不渗透也不蒸发的水平面上，测量降雨水深以确定降雨量的仪器。亦可连写成一个单词。 |
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raise the land | 初见陆地，陆地进入视界
| (v.t.). To sight LAND by approaching to the point where it appears above the HORIZON. | （及物动词）。当驶近某点时，陆地最初出现在地平线上而看到陆地。 |
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ram | 冰角，冰锤
| The underwater projection of ICE from an ICE FRONT, ICE WALL, ICEBERG, or FLOE. | 海上冰崖、冰壁、冰山或浮冰块等冰体在水下的投射部分。 |
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Ramark | 雷达指向标
| A radar marker beacon which continuously transmits a SIGNAL appearing as a radial line on the PPI, the line indicating the DIRECTION of the... more | 一种雷达信标台。它连续发射无线电信号，在雷达图像位置显示器（PPI）上表现为指示该信标方向的辐射线。雷达指向标主要供海上使用。名称ramark系由radar marker派生。 |