Praetrsonics
極超短波晶體聲學, 特超聲(學)
??? 情景例句
I can't wait to get home and relax.
我想馬上回家休息一下。
Why didn't you contact me?
為什么你不和我聯系？
OK. Where shall we meet?
好的。我們在什么地方會面呢？