不及物动词
名词
1. （潮水或海水）退，落
When the tide or the sea ebbs, its level gradually falls.
2. 退潮（期）;落潮（期）
The ebb or the ebb tide is one of the regular periods, usually two per day, when the sea gradually falls to a lower level as the tide moves away from the land.
3. 衰退;减退;减弱
If someone's life, support, or feeling ebbs, it becomes weaker and gradually disappears.
4. 处于低潮;处于衰退状态
If someone or something is at a low ebb or at their lowest ebb, they are not being very successful or profitable.
5. 起伏;消长；盛衰
You can use ebb and flow to describe the way that something repeatedly increases and decreases or rises and falls.