negative ads负面广告negativeadj.否定的；消极的；负面的；负的n.否定；反面意见；底片；[数]负数vt.否定negative doctor test负含硫试验negativebias voltage负偏压negative ddistortion负向失真negatively inotropic[医] 减弱收缩力的negative composition否定成分negative thermocline负跃层negative attenuation负衰减negative yield curve负收益率曲线negative circulation反循环negative-impedancen.负阻抗