Praetrsonics
极超短波晶体声学, 特超声(学)
🗣️ 情景例句
Lacks confidence and poise is nervous and ill at ease.
信心不足，不够自信，精神紧张，心神不定。
From which station does the train leave?
这列火车从哪个站开出呢？
The bus stop is in front of a station.
公共汽车站在火车站前面。