lowingn.牛鸣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 level sea - skimming超低空掠海low altitude bombing sight低空投弹瞄准器low-weir type classifier低堰式水力分级机low-frequency scattering低频散射low pressure steam heating低压蒸汽供暖low-grade antimony metal低品位金属锑low percentages of protein蛋白质含量较低low- field intensity MRI低场磁共振成像low-dose hormone therapy低剂量激素治疗low speed rolling missiles低速旋转导弹