Ech
abbr. echelon 梯形，梯次编队
🗣️ 情景例句
That's fine. Thank you.
很好。谢谢你。
Who is that over there?
那边那个人是谁？
I'm very sorry, sir.You must get off the bus.None of our passengers can change this note.
非常抱歉，先生。您必须下车。我们的乘客中没人能换开这张钞票。