这种橙汁的酸度很高，建议加水稀释后再饮用。

The high ___acidity of this orange juice makes it better to dilute with water before drinking.

这种苹果的酸度恰到好处，既不会太酸也不会太淡。

The ___acidity of this apple is just right, not too sharp nor too mild.

辛辣食物可能会加重胃酸过多的问题。

Spicy food may worsen ___acidity in the stomach.