解释说明的作用，广告宣传的作用、传播知识的作用。
Explanation of the role, the role of advertising, the role of spreading knowledge.
广告宣传活动是虚假的，但它起到了作用。
当然，微软几百万美元的广告宣传在这里也起到不少作用，但是Bing提供的搜索结果的总体质量也非常令人难忘。
Of course, Microsoft's multi-million dollar advertising campaign is surely helping here as well, but the general quality of the search results on Bing is quite impressive.
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