reduction box减速箱reductionn.减少；降低；减价；(化学)还原反应；(数学)约分reduction of train pipe pressure列车管减压量reduction of runoff and sediment减水减沙reduction to standard conditions归算至标准条件reduction factor of soil strength强度折减系数reduction of earthquake disasters防震减灾reduction to a common denominator通分reduction of cross sectional area断面压缩率,断面收缩率reduction of detection efficiency检波效率降低Reduction deformity of upper limb上肢短缺畸形Reduction deformity of lower limb下肢短缺畸形