triode

例句：

1. 1. The triode is a crucial component of the electronic circuit.
   三极管是电子电路中的关键部件。
2. 2. The transistor is used in various electronic devices for amplification and switching.
   晶体管用于各种电子设备中进行放大和切换。
3. 3. The triode valve was once the standard for audio amplifiers.
   三极阀曾是音频放大器的标准设备。