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。

youdao

Production possibility set in DEA has two equivalent forms: sum form and intersection form. In comparison, the later one has more geometric visualization and convenience of calculation.

DEA的生产可能集有两种等价形式—和形式及交形式。相比较而言，交形式更具几何直观性及计算便利性。

youdao

Evaluate the partition function as and check that the result agrees with the standard geometric series sum.

估算配分函数为并检查结果与标准的几何级数和一致。

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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。

麻省理工公开课 - 固态化学导论课程节选

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。

麻省理工公开课 - 固态化学导论课程节选