Talweg
深泓线, 最深谷底线
🗣️ 情景例句
I've seen pictures of him.
我见过他的照片。
She is singing in practice.
她在练习唱歌。
Have you decided what music you'd like us to play at the party?
你决定好要我们在乡村聚会中演奏什么音乐了吗？