识别一个坏广告不是很容易，但总有一些蛛丝马迹可以追寻。
It is not always easy to spot a bad AD, but there are a few things we can look out for.
弹出式广告让人留下坏印象。
大部分投诉者指出，呼叫中心工作人员在广告中的这一形象给孩子们树立了坏榜样。
Most callers said that it set a bad example to children, or ridiculed people with speech impediments.
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