求數(shù)學(xué)定義翻譯（有關(guān)arithmetic mean和geometric mean的）
如題,看到arithmetic mean 的英文定義,但不知道中文是什么意思,求翻譯.原句如下：
if there is one term falling between two given terms of an arithmetic sequence, it's called arithmetic mean.
另外,還有對應(yīng)的geometric mean的：
if there is one term falling between two given terms of an geometric sequence, it's called geometric mean.
請知道的人幫忙解答一下,謝謝!
灌水勿答,只會用翻譯器的勿答.