| 单词 | 电频率 |
| 释义 | 〔radome〕A domelike shell transparent to radio-frequency radiation, used to house a radar antenna.雷达天线罩：有顶构造，可以让无线电频率辐射穿过，用于隐蔽雷达天线〔megahertz〕One million cycles per second. Used especially as a radio-frequency unit. Also called megacycle 百万赫：每秒一百万周。尤用作无线电频率的单位 也作 megacycle〔airwave〕The medium used for the transmission of radio and television signals. Often used in the plural.波段，无线电频率：传送无线电和电视信号的媒介。常用复数〔scanner〕A receiver that continuously broadcasts signals it detects from specified radio frequencies:扫描天线：一种接收器，可连续不断地播送针对特定无线电频率所检波到的信号：〔heterodyne〕To combine (a radio-frequency wave) with a locally generated wave of different frequency in order to produce a new frequency equal to the sum or difference of the two.外差：把（一个无线电频率波）与另一个频率不同的局部产生的电波层混合，以产生相当于原来两个的总和或差拍的新频率 |
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