Cathetron
[电]外控式三极汞气整流管
🗣️ 情景例句
That isn't necessary.
这倒不必。
Can you imagine what it would be like to live without electricity?
你能想象出生活中没有电会是怎么样的一种情形吗？
There's no need to be worried. We're both fine.
没有必要嘛。我们两个都挺好。