Ebbs
n. 退潮( ebb的名词复数 ); 落潮; 衰退\\nv. （指潮水）退( ebb的第三人称单数 ); 落; 减少; 衰落
🗣️ 情景例句
Of course. It's on the fifth floor of Building No.4. Let's go there.
当然可以。展室在四号楼五层，我们上去吧。
Who is he?
他是谁？
a trough (the lowest point), a height (the vertical distance from the trough to the crest),
波谷（最低点）、浪高（从波谷到浪峰的垂直距离）