lowerleg足loweradj.低的；下级的；下层的v.降低；减弱；跌落lowering working gate下沉式工作门lower limestone group下灰岩群lower velocity layers低速软弱夹层lower Devonian series下泥盆统lower quartile length下四分位长度lower bound algorithm[计] 下界算法lower incisor missing下切牙先天缺失lower-level offense低等级犯罪Lower Paleozoic Group下古生界lower calorific value低热值,低位热值