词汇	temporal frequency
释义	temporal frequency 时间频率
随便看	water retaining works water-retardation frequency portion water retarding area water retarding standard water retention water-retention water retention ability water retention agent water-retention agent water retention agents water-retention and slow-release fertilizers water-retention and thickening admixture water retention capability of soil water retention capacity Water retention characteristic water retention characteristic curves water retention characteristics water retention coefficient water-retention coefficient Water retention curve water-retention effect water retention factor water-retention material water retention measures water retention performance