Listen to a conversation between a student and a librarian.
请听一段学生和图书管理员之间的对话。
Listen to a conversation between a student and the librarian employee.
请听一段学生和图书管理员之间的对话。
This file defines four roles: manager, librarian, student, and visitor.
这个文件定义4个角色:manager、librarian、student和visitor。
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