实际偏差 meaning in English

actual deviation

In low matric potential state , the a & p model can be use to predict water retention characteristics , but in high matric potential state , it cannot get good result . in addition of soil pore connectivity , to correct the a & p model , it can get good result in whole water content range
但在高吸力段a & p模型预测的结果与实际偏差较大，考虑到土壤孔隙实际联通状况，修正a & p模型，使供试的四种在整个含水量范围对土壤水分特征曲线都得到了较好的拟合。