Ultraphonic
超声的, 超听的
🗣️ 情景例句
I have just begun to learn and my serve isn't very good.
我刚刚开始学习，发球不太好。
How many slices are you going to use?
你要用几片？
Oh, that's quite early! Where are we going to meet?
噢，那很早！我们打算在哪儿会合？