Now we finally come to electronic instruments. In these instruments sounds are produced by varying the oscillations of radio tubes with the exception of the Hammond organ.
现在该说说电子乐器了。除哈蒙德电风琴，这类乐器全是靠变换无线电真空管振荡而发声的。
We have, for example, dramatically reduced the physical bulk of our radios, by substituting transistors for vacuum tubes.
例如，我们用晶体管取代真空管，使无线电的体积大为缩
"The technology of radio improvement followed the development of the vacuum tube, the electronic-tube oscillator, the tuned circuit, and other components."
无线电技术随着真空管、电子管振荡器、调谐电路以及其它部件的发展而不断改善。
S/C Vacuum Sol Control
Ｓ／Ｃ真空电磁螺线管控制
The Configuration and Simulation Analysis of the Antenna in Air Based Radio Monitoring
空中无线电监测中天线配置及仿真分析
contracted code sonde
发送电码无线电探空仪
aeronautical radio communication station
航空无线电通信电台
aeronautical radio beacon station
航空无线电信标电台
Transmission of messages by radiotelegraphy.
用无线电传真传送信息
"Radio wave are used in standard Broadcast radio and television, navigation and air-traffic control, cellular telephony, and even remote-controlled toys."
无线电波用于电视、电台、导航、空中交通管制、通讯、雷达、遥控玩具。
radiosounding system
无线电高空测候技术
radio controlled aerial target
无线电控制的空中目标
radiosonde-radiowind system
无线电探空测风系统
aeronautical radionavigation service
航空无线电导航业务
aeronautical communications log
航空无线电台工作日志
variable-audio-frequency radiosonde
变声频无线电探空仪
radio controlled aerial-navigation
无线电控制空中航行区
radio-wave refractive index of air
无线电波的空气折射率