ebb and flow

US /ɛb ənd flo/

UK /eb ænd fləu/

B1 中級
n.名詞消長
The ebb and flow of the tide is a constant cycle.
n.名詞盛衰
Life is characterized by its ebb and flow of fortune.
n.名詞起伏
The ebb and flow of the market can be unpredictable.

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