Ultraphonic
超声的, 超听的
🗣️ 情景例句
Hi, Carl.
嗨， Carl。
Don't forget to put stamps on the letter before you mail it.
不要忘记在寄信以前把邮票贴在信封上。
Mrs.Richards sent her children to school and went upstairs to her bedroom.
把孩子送去上学，然后来到楼上自己的卧室。