low NO低NOx燃烧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 content alloy低合金low fat decoction降脂汤low-sodium diet[医] 少纳饮食low-lying field圩区Low Earning Crowd低收入人群Low-level laser弱激光low rectum cancer低位直肠癌low potassium ion低钾离子low-resistivity低电阻率low - grade ore低品位