average
单词辨析：
通常用于数量。
They have an average-sized backyard.
他们的后院中等大小。
She is in her early thirties and of average height.
她30岁出头，中等个儿。
指处于中间位置的或在一组数值中居中的。
a median point/price
中点/中等价位
The median age of that group is 36.
那组的中间年龄为36岁。
通常用于大小、水平、数量等。
medium depth/height
中等深度/身材
This cloth is of medium quality.
这种布质量平平。
The red cap is of a medium size.
那顶红色的帽子是中号的。
Fry the fish over a medium heat.
用中火炸这条鱼。
相关例句：
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。
The train's average speed was no better than that of our bicycles.
火车的平均速度比我们骑自行车的速度快不了多少。
We averaged 42 miles per hour.
我们的平均时速是每小时42英里。
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 average pay rise equalled 1.41 times inflation.
薪水的平均增长幅度是通货膨胀率的1.41倍。
On average, American firms remain the most productive in the world.
总体来讲，美国公司在全球范围内还是产值最高。