Praetersonics
高超声波学, 极超短波晶体声学
🗣️ 情景例句
Let me help.
我来帮忙。
When the police arrived, I was doing the housework.
当警察来的时候，我在做家务。
If she finds out you spilled ink on her coat, she'll blow her stack.
如果她发现你在她上衣上洒了墨水，她会大发脾气的。