lowbelln.小铃lowadj.低的；少的；低落的；低声的；卑劣的；低等的adv.低地；低声地；低下地；廉价地n.低水平；低价；低谷v.哞哞叫low speed paper tape reader低速纸带读出器low manganese casting steel低锰铸钢low-plasticity sandy soil低塑性砂土low - temperature biofilm低温生物膜low dosage ion implantation低剂量离子注入low-efficiency management低效管理low frequency analog signal低频模拟信号low hysteresis carbon black低滞后炭黑low mountains and hill area低山丘陵区low temperature salt-bath低温盐浴