the average of和 a average of 有区别吗
问题描述：
the average of和 a average of 有区别吗
答
the average of 是指具体的某事物的平均数,an average of是泛指某个平均数,不是特指的例如,the average of our wage is not very highwe have many books and we have an average of 35 books per person...