Fuel prices fluctuate so much that our shipping costs change every single month.

燃料價格波動很大，所以我們的運費每個月都不一樣。

The exchange rate has fluctuated sharply this week, so please confirm the final invoice amount.

本週匯率劇烈波動，請確認最終的發票金額。

Hotel rates tend to fluctuate during peak travel season, so book your rooms early.

旅遊旺季時飯店房價往往起伏不定，請盡早訂房。