In general,old people tend to be more conservative than the younger generation in their speech habits,and feel more at home using old words,and less ready to incorporate new terms in to their vocabulary. 一何兆熊《新编简明英语语言学教程》P117• In general, old people tend to be more conservative than the younger generation in their speech habits, and feel more at home using old words, and less ready to incorporate new terms in to their vocabulary. —何兆熊《新编简明英语语言学教程》P117