On average, a lot is sold every three seconds.

这里平均每三秒就能卖出一大批。

On average, about 20% of the population has some form of disability.

平均而言，大约 20% 的人口有某种形式的残疾。

Oh, on average. -Oh, an hour already today.

喔，平均。 -今天已经用一小时了。

On average, Ebola kills half the people it infects.

平均来说，埃博拉感染者的死亡率为50%。

Adult great whites reach 15 feet on average.

成年的大白鲨平均会长到 15 英尺。

Each person infects 1.3 other people on average.

即每个已感染者平均传给1.3个人。

On average (or typically), they serve 15 years.

平均说来（或通常），他们会任职15年。

On average, men are better educated than women.

平均而言，男性受教育程度高于女性。

For about one and a half hours on average.

平均一个半小时吧。

The fact is, college graduates, on average, earn more.

事实上，大学毕业生的平均收入更高。