Definition
The regular pattern of increase and decrease in the level or intensity of something.
起伏不定
The company's finances experienced an ebb and flow as the market conditions changed.
随着市场状况的变化，公司的财务状况经历了起起落落。
The number of tourists on the beach ebbs and flows daily.
海滩上的游客数量每天都有起落。
Political support tends to ebb and flow during each election cycle.
政治支持度在每次选举周期中往往会起起落落。