What he says you should do instead is to take the geometric average of gross returns.

他认为应该,对每年的收益求几何平均

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This is called the geometric average and it's used only for positive numbers.

这种平均叫几何平均,只能用于正的数值

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And he defined the average in terms of not the sum divided by two, but he chose the geometric mean.

鲍林定义平均并不是,简单相加在除以二，他选择几何平均。

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Because very often,if we only study the average, we only see the average,we only see the geometric shapes and completely missed the children on the bus.

因为很多时候，如果我们只研究平均水平，那就只会看到平均的结果，只看到几何形状,完全忽略了汽车上的孩子。

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The other kind of average is called the geometric average.

这种均值叫做几何平均

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In fact, there are some very old books that show this as the average, the sum divided by two arithmetic mean, but the modern practice is to use the geometric mean.

事实上，一些很老的书籍上,平均的定义就是算数意义的，总的来说被分为两种算数意义，但现代我们多用几何意义。

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