on the average / on average / on an average三者区别是什么这三个词组是否都对,有什么区别呢
问题描述：
on the average / on average / on an average三者区别是什么
这三个词组是否都对,有什么区别呢
答
on the average
on the average[简明英汉词典]
平均,按平均数计算;一般地说
on average
on average[简明英汉词典]
平均起来
on an average
on an average[简明英汉词典]
adv. 作为平均数