广告宣传活动是虚假的，但它起到了作用。

The AD campaign was false, but it was working.

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这次广告宣传对这种新型汽车的成功起了作用。

The advertising campaign has contributed to the success of the new car.

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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.

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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.

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