Permatron
[计] 磁控管
🗣️ 情景例句
He tried to smile.
他设法要微笑。
I cannot hear the tape.
这卷录音带什么都听不到。
they must be sedulously tended, if the vivifying fruits are to be at hand when needed.
要想在需要的时候可随手摘取充满生机的果实，还需要勤勉地护理。