n.酸性；酸度
The soil is often very cool and high in acidity. 這種土壤溫度較低,酸性大。
The alkaline solution may help to reduce acidity. 堿性溶液有助于降低酸度。
n.平靜；安靜；溫和
n.胃酸過多癥
n.酸缺乏
