Kathetron
一种有外栅极的三极管, 辉光放电管
🗣️ 情景例句
Hi, I'm Mary.
嗨，你好，我叫玛丽。
Could you tell me the cost of production per unit?
请你告诉我每件成品的生产成本好吗？
I was very tired when I arrived home. I'd been working hard all day.
我到家时非常累。我一整天都在玩命地干！