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 zone负波带Negative move负迁移negative duty负占空比negative judg负判断negative ions负离子negative grid负栅negative band阴性带, 浅染带[见于染色体显带]negative coma负彗形象差negative stud负极螺桩negative pion负π介子

1. They are urging Obama to fight back, mindful of the Republican attack ads that helped doom Democrat John Kerry's presidential bid four years ago.
   他们注意到共和党人四年前的负面广告从一定程度上击垮了克里的总统竞选，因此敦促奥巴马展开反击。