Puckle
一种锯齿波振荡电路
🗣️ 情景例句
While sitting on the bus I often meet interesting people.
乘车时，我经常碰到一些有趣的人。
Excuse me! I'm sorry I startled you!
对不起！很抱歉，让你受惊了！
I have a letter of introduction here.
我这儿有一封介绍信。