• 下牙托

loweringadj.天阴沉的；闷闷不乐的动词lower的现在分词形式.loweradj.低的；下级的；下层的v.降低；减弱；跌落lower extremity amputee下肢截肢者lower temperature crack低温裂缝lower numbered variable低编号变量lower lateral cartilage下外侧软骨lower triangular matrix下三角形矩阵lower edge-band value下边缘频带值Lower wetland grassland低湿地草地lower abdomen carbuncle丹毒痈lower paper-guide rod下导纸杆Lower-middle Triassic下中三叠统