电子管的英文：
radio tube; vacuum tube

参考例句：

Hollow cathode lamp
空心阴极电子管

An electron tube with a photosensitive cathode.
光电管具有感光的阴极电子管

The transmitter was pulsed by an electron tube.
电子管使发射器产生脉冲波。

UHF electronstatic control tube
静电控制超高频电子管(栅控管)

A tube or a transistor can amplify an incoming signal
电子管和晶体管能放大输入的信号。

The electronmagnetic wave is produced by microwave tubes called klystrons
电磁波是由一种称为速调管的微波电子管产生的。

Electronics, on the other hand, deals with the movement of free electrons in a vacuum or in semiconductors.
而另一方面电子学则论述自由电子在电子管或半导体里流动的情况。

An electron tube having a cathode and an anode.
电子二极管有一个阳极和一个阴极的电子管

Small size and low power consumption are the two important factors that make transistors preferable to electron tubes.
体积小和消耗功率低，这两个重要因素使晶体管比电子管优越。

The crystal detector was soon replaced by the thermionic value and had largely become obsolete by 1939
晶体检波器不久即被热电子管所代替，到1939年已大部分变成了废物。

radio是什么意思：
n. 收音机；无线电广播台
v. 用无线电发送

radio broadcasttransmitting statio
无线电广播发射台

Send a message by radio
用无线电发送讯息；发报

Radio station is off the air.
广播之声停止了广播。

tube是什么意思：
n. 管子；软管；内胎；地铁；电视
v.把…装管；把…弄成管状；用管输送；乘地铁；不及格

The tubes are individually connected in order to the tubes of a multiple manometer
这些总压管依次分别连接到一个多管压力计的各个管子上。

darcy impact pressure tube
达喂力管

inner core tube
内倒望远镜

vacuum是什么意思：
n. 真空；空白；空虚；真空吸尘器
v. 用真空吸尘器清扫

Is there a vacuum cleaner?
有真空吸尘器吗？

Some people are living in a vacuum.
有些人过着与世隔绝的生活。

clean(sth)with a vacuum cleaner
用真空吸尘器清扫（某物）