大多数未熟的水果都是酸的.Most green fruit is sour.未熟的苹果是酸的.Green apples are sour.我唯一一次生病是因为吃了未熟的梨。I was only ill once and that came of eating an unripe pear....

“未熟”的英语可以翻译为：immaturity，crudity，greenness，inexperience ...