loweryadj.阴暗的；阴霾的loweradj.低的；下级的；下层的v.降低；减弱；跌落lower bracket下轴承支架lower society底层社会lower machine下位机lower product重量下乘法lower surface下表面lower scraper底辊刮刀lower subsoil心土下层lowering plan下放方案lower measure内测度lower tumbler下导轮