Echosounding
音响测深法
🗣️ 情景例句
We're having a small to-do, and I'd really be happy if you come.
我们打算热闹一下，我真心的希望你能赏光。
Rest breeds rust.
停止须生锈。
the most destructive effects have come not from physical weapons but from ideas.
破坏作用最大的不是杀人的武器，而是思想。