New words：

average ['ævəridʒ]
n.平均水平；平均数；一般水准
adj.平均的；典型的；正常的；普通的
v.平均为；计算出…的平均数

Sample Sentences：

The average of 4,6 and 8 is 6.
If you average 4, 5 and 9, you get 6.
The average age of the boys in this class is fifteen.
There was nothing special about the meal; it was average.

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