Sam was given a list of books to read by his teacher, but he has just had an eye operation and needs some apps that can store the books and read them aloud to him.
老师给了山姆一张要读的书的清单，但他刚刚做了眼部手术，需要一些可以存储书并对他出声朗读的应用程序。
2
The return from this operation is a list of numbers that meet my filter criteria, which I coerce into a set to remove duplicates.
从此操作返回的是一组满足过滤标准的数字列表，我将其放入一个集合来删除重复值。
3
Next you specify the book list service operation, which describes what the book list service does.