Praetrsonics
极超短波晶体声学, 特超声(学)
🗣️ 情景例句
And there's so much to do.
而且这里总是有许多事可做。
I had never seen a grown man break down and cry.
我从未曾看到过一个这么强壮的汉子痛哭失声。
Does he have your number?
他有你的电话号码吗？