[, ]frequent changes in the size, amount, level, etc. of sth, especially from one extreme to another 波动；起伏◆We saw wild fluctuations in sales from week to week. 我们看到每周的销售量都起伏不定、差异巨大。⨁day-to-day / monthly / seasonal / short-term / weekly fluctuations 每日的／每月的／季节性的／短期的／每周的波动