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。
But the negative sides of advertisements will mislead the customers.
但是广告的负面对误导消费者。
But, I should not forget about the negative sides.
但是，我不应该忘记的消极面。他们不少必要。
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