Each of the volumes contains a topic outline and index, and a cumulative index is found in volume 4.

每卷包含一个题目概要和索引，并且一个多重索引被在第4卷发现。

youdao

Each of the volumes contains a topic outline and index, and a cumulative index is found in volume 4.

每卷包含一个题目概要和索引，并且一个多重索引被在第4卷发现。

youdao