2014高中英语(牛津译林版必修3,安徽专用)同步课件:Unit 2 Language Section ⅠWelcome to the unit,Reading
2014高中英语(牛津译林版必修3,安徽专用)同步课件:Unit 2 Language Section ⅠWelcome to the unit,Reading第5页

The meaning of a word depends on what a particular person means by it in a particular situation and it is clear that what a child means by a word will change as he gains more experience of the world. Thus the use at seven months of “mama” as a greeting for his mother can't be dismissed as a meaningless sound simply because he also uses it at other time for his father, his dog, or anything else he likes.