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

There are some important signs, I think, especially in the first two books of Paradise Lost of what we can think of as Milton's - it's a literary fantasy, a literary fantasy of forgetfulness.

我认为有一些重要的迹象，尤其是在,《失乐园》的前两册书中,从那里我们可以思考弥尔顿之所想,这是一次对于遗忘的文学幻想。

耶鲁公开课 - 弥尔顿课程节选

There are just two books for the course; they're both at Labyrinth.

这门课的教材只有两门;,都比较繁琐难懂。

耶鲁公开课 - 现代诗歌课程节选