Echosounding
音响测深法
🗣️ 情景例句
I'm glad you came. You're welcome any time.
我很高兴你能来。随时都欢迎你们来。
In college I majored in physics, What was you major?
大学时我主修物理，你主修什么呢？
I have no idea.
我没有头绪。