an average

The boats remain at sea for an average of ten days at a time

这些船只每次在海上平均航行10天。

The fish were counted and an average weight recorded.

数了数鱼的数量，并把平均重量记录了下来。

The price of a PC has fallen by an average of 25% a year since 1982

自1982年以来，个人计算机的单价年均下降25%。

In 1951 AC went public, having achieved an average annual profit of more than £ 50,000.

AC公司于1951年上市，当时平均年利润为5万多英镑。

Packaging is about a third of what is found in an average British dustbin.

英国垃圾桶里平均约有1/3是产品包装。

On an average we would be spending £ 300 per day.

平均下来，我们每天要花费300英镑。

You'll be able to earn an average rate of return of 8% on your investments.

你将能获得8%的平均投资收益率。

An average electric bill might go up$ 2 or$ 3 per month

每月电费可能会平均增加两三美元。

Johnson carried the ball an average of 6 yards per rush.

约翰逊跑动带球平均每次行进6码。

Parents spend an average of$ 220 a year on toys.

父母为孩子买玩具的花费每年平均为220元。

Amount to or come to an average, without loss or gain.

总计或者共计一个平均数，没有遗失或者增进。

I was just an average sort of student.

我只是一个普通的学生。

It takes an average of ten weeks for a house sale to be completed.

售出一幢房子平均需要10周的时间。

Kelly had scored an average of 147 on three separate IQ tests

凯利在3项不同的智商测试中平均得分147。

Most people walk at an average rate of 5 kilometres an hour.

大多数人步行的平均速度为每小时5公里。

Do you know how to work out an average?

你知道如何计算平均数 吗 ?