这牛奶已变酸了.This milk has gone sour.奶变酸就凝块.Milk clots when it turns sour.这牛奶快要变酸了.This milk is on the turn , ie about to become sour....

“变酸”的拼音为：biàn suān...

“变酸”的英语可以翻译为：souring，acidification，clabber，fox，go sour ...