category of reserves

例句：

1. 1.The book has three main categories: fiction, non-fiction, and poetry.
   这本书有三个主要类别：小说、非小说和诗歌。
2. 2.The new product falls into two categories: high-end and mid-range.
   新产品分为高端和中端两个类别。
3. 3.This category of animals is known for their unique adaptations to their environment.
   这种动物的分类以其对环境的特有适应而闻名。