But with both sides firing off negative ads at each other, experts say it is hard to know whether people are paying attention or to gauge the impact.
虽然双方展开了负面广告大战，但是专家们说，很难确定人们是否注意这类广告，也很难衡量这些广告的影响。
Kate argued vehemently against using these ads, but she was overruled by Vince. Now she's sure she was right; negative ads rarely work.
凯特曾强烈反对用这些广告，但她的意见被文斯驳回，现在她确信自己是正确的，负面的广告不起什么作用。
Kate argued vehemently against using these ads, but she was overruled by Vince. Now she's sure she was right; negative ads rarely work.
凯特曾强烈反对用这些广告，但她的意见被文斯驳回，现在她确信自己是正确的，负面的广告不起什么作用。
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