IRGn.记录间隔IRabbr.信息检索(=information retrieval)irreducible subvariety不可约子簇irrigating water quota灌水定额irrevesible heat cycle不可逆热循环irreconcilable enemies势不两立的仇敌iridium oxide resistor氧化铱电阻器irradiant compensation光照补偿irrigational flowmeter灌溉流量计irrigation requirement灌溉需水量irrigator washing unit冲洗器洗涤机irrigation return flow灌溉回水,灌溉退水