IRGn.记录间隔IRabbr.信息检索(=information retrieval)irredeemable currency不能兑现的通货,不兑换货币irreducible trinomial不可约三项式irreducible component不可约成分irradiated ergosterol照射麦角甾醇irrigation techniques烤烟irreducible subobject不可约子对象irreducible semigroup不可约半群IR emissivity control电致变发射率Irritability rhinitis过敏性鼻炎irreducible character不可约特征标