【1+1英文】

Angela: "There has been talk at school about canceling the concert."
Andy: "Really? Who did you hear that from?"
Angela: "Just word of mouth."

【1+1中文】

安吉拉：听说学校要取消音乐会！
安 迪：真的吗？你听谁说的？
安吉拉：只是大家都这么传！

【1+1解析】

When you say that you heard something word of mouth, you are not being specific about whose mouth you heard it from; just that you heard it from another person.
中文意思：“口耳相传的”口碑。