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VERB
（潮水或海水）退，落
When the tide or the sea ebbs, its level gradually falls.
例句
When the tide ebbs it's a rock pool inhabited by crustaceans.
退潮時，它便成為甲殼動物居住的巖石區潮水潭。
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N-COUNT
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.
例句
...the spring ebb tide...
春季退潮
We decided to leave on the ebb at six o'clock next morning.
我們決定第二天早晨6點鐘趁退潮時離開。
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VERB
衰退;減退;減弱
If someone's life, support, or feeling ebbs, it becomes weaker and gradually disappears.
例句
...as a man's physical strength ebbs...
隨著人體力的衰退
Were there occasions when enthusiasm ebbed?
會有熱情減退的時候么？
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PHRASE
處于低潮;處于衰退狀態
If someone or something is at a low ebb or at their lowest ebb, they are not being very successful or profitable.
例句
...a time when everyone is tired and at a low ebb...
每個人都疲憊不堪、處于低潮的一段時間
The Government's popularity is at its lowest ebb.
政府的支持率跌到了最低點。
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PHRASE
起伏;消長；盛衰
You can use ebb and flow to describe the way that something repeatedly increases and decreases or rises and falls.
例句
...the ebb and flow of feeling and moods.
感覺和情緒的起伏