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1·The news spread by word of mouth.

这消息是口头传开的。《牛津词典》

2·The story has been passed down by word of mouth.

这个故事是口头流传下来的。《柯林斯英汉双解大词典》

3·Here is some advice for small businesses about word of mouth advertising.

以下是给小企业的一些关于口碑广告的建议。

4·Word of mouth advertising happens when one person tells another about a good experience with a product or service.

当一个人告诉另一个人对产品或服务的良好体验时，口碑广告就发生了。

5·The best form of advertising is probably word of mouth advertising which occurs when people tell their friends about the benefits of products or services that they have purchased.

最好的广告形式可能是口碑营销。当人们将所购买的产品或服务的好处告诉他们的朋友时，口碑营销就出现了。

6·At the very beginning, information spread by word of mouth.

最开始的时候，信息是通过口口相传的。

7·It sells its products by word of mouth.

它靠口口相传来销售产品。

8·I have informed him by word of mouth.

我已口头通知他了。《新英汉大辞典》

9·He agreed by word of mouth.

他口头上同意了。

10·Word of mouth can be very powerful.

舆论的力量是很大的。