北回归线水土保持观察站
soil and water conservation station on Tropic of C
商业干洗后外观(外观保持性）
appearance after commercial drycleaning
外观保持简化法
appearance-preserving simplification algorithm
接触保持指示器
contact holding indicator
节能环保指标
index of energy saving and environmental protection
不可持续性指标标准值
standard value of unsustainability
多指标指派问题
multi-index assignment problems