RB: I see you also provide a video tutorial series for Rails 3 as well. Is this companion content for the book or completely separate material than the book?
RB：我看到你还提供了一系列的Rails3视频教程，这些视频是补充书里面的内容呢，还是完全不相关呢？
RB: I see you also provide a video tutorial series for Rails 3 as well. Is this companion content for the book or completely separate material than the book?
RB：我看到你还提供了一系列的Rails3视频教程，这些视频是补充书里面的内容呢，还是完全不相关呢？
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