请注意，Rails 为每篇文章生成了模型对象和迁移。
Notice that Rails generates your model objects and migrations for each article. Edit db/migrate/001_create_articles.rb to look like Listing 3
从本周起，对于NPG旗下的49种期刊，订阅任意一本的用户可以就其有权阅读的文章生成链接，并在任何论坛上与他人分享。
Starting this week, subscribers to any of NPG's 49 periodicals can create a link to any article they have legitimate access to and share it with others in any online forum.
这周开始，对于自然出版集团下的49家期刊，订阅任意一本的用户可以就其有权阅读的文章生成链接，该链接可以放在任意网上论坛上与他人分享。
Starting this week, subscribers to any of NPG's 49 periodicals can create a link to any article they have legitimate access to and share it with others in any online forum.
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