Praetrsonics
极超短波晶体声学, 特超声(学)
🗣️ 情景例句
A dime is 10 cents. It's one tenth of a dollar.
一角有十美分，是一美元的十分之一。
At 6 o'clock sharp.
6点。
There's no need for that. We'll have dinner another time.
不必为那件事惭愧。我们改个时间再共进晚餐吧。