Cathetron
[电]外控式三极汞气整流管
🗣️ 情景例句
Really. I didn't like math.
真的。我不喜欢数学。
How long will it take for a telegram to get to California?
你把电报传到加州要多长时间？
No one can avoid being influenced by advertisements.
没有人能避免受广告的影响。