Praetersonics
高超声波学, 极超短波晶体声学
🗣️ 情景例句
Done! You and I, Mrs. Stewart.
办到了！ Stewart太太和我，
He looks much younger than he is.
他看起来比他实际上年轻得多。
Just now we all watched you sign to show that you had received the cheque.
刚才我们大家都观察到了你为表明已收到那张支票而签名。