IRB=industrial reference black 工业基准黑IRabbr.信息检索(=information retrieval)irredeemable bank note[经] 不能兑现的银行票据iridocyclo choroiditis虹膜睫状体脉络膜炎IRFPA imaging detector红外焦平面成像器件irrigation layout plan灌区平面布置图,灌区布置规划irreducible burdens.无法减轻的负担irreletive information不相关情报irreducible characters不可约特征标Irrigation of bronchus支气管冲洗irredeemable losses.不可挽回的损失IR Immediate Rendering直接渲染