Praetrsonics
极超短波晶体声学, 特超声(学)
🗣️ 情景例句
Maybe you saw our commercials on TV.
也许你在电视上看过我们的广告。
Please let me know.
请告诉我一声。
A fine rain began to fall on our heads and the temperature had dropped.
一阵小雨落到我们头上，气温开始下降了。