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Without observing the inner side of the practical blackbody, the axial reflectivity is maximum, and the reflectivity decreases as the angle that departs from axis increases. 在沒(méi)有觀測(cè)到側(cè)壁的前提下，其軸曏反射率最大，隨著偏離軸線角度的增加，反射率逐漸減小。