collan.颈名词collum的复数形式.COLLpref.表示“粘的；胶的”=collo.collapsing rule降级规则collapsing hill崩岗collison detect冲突检测collinear force共线力collinear plane共线面collimated beam准直射束耗Collin's glands准直水平collegial girls大学女生collum stapedis镫骨颈collimated lamp准直灯