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。

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But the negative sides of advertisements will mislead the customers.

但是广告的负面对误导消费者。

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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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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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