unripe [ˌʌnˈraɪp]

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adj.未成熟的；n.未成熟

not fully developed or mature; not ripe;

I was only ill once and that came of eating an unripe pear. 我唯一一次生病是因为吃了未熟的梨。
Half of the apples are unripe. 一半的苹果不熟。