The story includes the following use cases: sign in > search a book > view book detail > add book to cart > view cart > pay for the book.
情况包含了以下的用例：签名 > 搜索一本书 > 评审书的具体情况 > 向货架添加书籍 > 评审货架 > 为书籍付款。
From then on, when they sign-in to a computer in the library, renew a book, or check-out materials, they would be using the username and password that they created.
到了那时候，读者要续借图书或归还资料，只要通过自设的用户名和密码登录图书馆的任何一台电脑即可。
He said in an interview with BBC Radio Wales: 'I can't reveal much about the new Harry Potter film, which I don't understand because the book is out anyway, but I had to sign a clause that I wouldn't.
他在BBC威尔士的采访中说：”我不能剧透太多关于这部新的哈利波特电影，因为尽管是出书了，但是我还是签了我不用签的一份协议。
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