vacuum-tube noise

例句：

1. 1. The vacuum tubes in the old radio were making a lot of noise.
   旧收音机里的真空管发出了很多噪音。
2. 2. The engineers were trying to reduce the vacuum tube noise in the new machine.
   工程师们正在努力减少新机器中的真空管噪音。
3. 3. The vacuum tube noise was so loud that it drowned out the sound of the music.
   真空管噪音太响了，以至于音乐的声音都被淹没了。