Half fruit juice and half water are mixed into a beverage, and the content of fruit juice accounts for1/2 of this beverage;

Pour out half of this cup and fill it with water. At this time, the content of fruit juice accounts for1/2×1/2 =1/4 of this cup.

Pour out half of this drink and fill it with water. At this time, the content of fruit juice accounts for1/4×1/2 =1/8 of this beverage.