为了快速查阅，一定要查看教科书后面的索引。

For quick reference, always check the ___index at the back of the textbook.

对这本书的主要批评在于其组织混乱的索引。

The book's major criticism was its poorly organised ___index.

根据索引，关于气候变化的讨论从第245页开始。

According to the ___index, the discussion on climate change begins on page 245.