cold magnetron

例句：

1. 1. The cold magnetron is used in radios and televisions to amplify the signal.
   冷阴极磁控管用于收音机和电视机中放大信号。
2. 2.The engineer replaced the old cold magnetron with a new one.
   工程师用一个新的来替换旧的冷阴极磁控管。
3. 3. The cold magnetron is responsible for producing high-frequency waves that power the electronic devices.
   冷阴极磁控管负责产生高频波，为电子设备提供动力。