roll number

例句：

1. 1. The libraryhas a roll number system for tracking books.
   图书馆有一个卷号系统来追踪书籍。
2. 2.We need to find the correct roll numberto check out the new movie.
   我们需要找到正确的卷号来借阅新电影。
3. 3.The catalog is organized by roll number, making it easy to find what you're looking for.
   目录按卷号组织，使您容易找到您正在寻找的内容。