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 bone factor负骨因子negative competition消极比赛negative conductance负电导negative going pulse负脉冲negative phase relay负相序继电器,反相继电器negative g tolerance负重力加速度容限negative index media负折射介质negative cyclotropia内旋转斜视negative infanticide消极杀婴negative chemography负性化学显影