Quadratron
热阴极四极管
🗣️ 情景例句
You look very young. How old are you?
你看起来真年轻， 你多大了？
Habit is a second nature.
习惯成自然。
No, thanks. Help yourselves to the cakes.
不必，谢谢。请随便吃些糕点吧。