在中文里，'本'是用于书籍的量词。

In Chinese, '本' is the ___classifier used for books.

这个分类器能准确区分电子邮件是否为垃圾邮件。

This ___classifier can accurately distinguish whether an email is spam or not.

垃圾分类指导员帮助我们正确区分可回收和不可回收垃圾。

The waste ___classifier helps us correctly separate recyclable and non-recyclable trash.