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1·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》

2·The news spread by word of mouth.

这消息是口头传开的。《牛津词典》

3·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。

4·It sells its products by word of mouth.

它靠口口相传来销售产品。

5·I have informed him by word of mouth.

我已口头通知他了。《新英汉大辞典》

6·He agreed by word of mouth.

他口头上同意了。

7·It spread entirely by word of mouth.

网站的传播完全通过口碑。

8·I have informed her by word of mouth.

我已口头通知他了。

9·He received the news by word of mouth.

他得到的是口头的消息。

10·The news was passed on by word of mouth.

消息通过口头传开了。