It's related to the new "asset pipeline" added in Rails 3.1.
The reason the image isn't showing up could be caused by multiple things -
Is the server running in development or production mode? (Development compiles assets on the fly, production assumes they have been pre-compiled.) Do any messages appear in the server log relating to "rails.png"?
Its a default rails home page. It shows your local configured environment when you click on link about your applications environment. You need not to do anything whit this page. In place of this page you need to set your default home page. And yes there is nothing wrong with the installation.
Simply means Rails has changed from what you have in the tutorial, try to check up the new things with the version of rails you have on your machine, best is to ensure you are using the same version of rails from the tutorial in practice else you might end up confused
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它与 Rails 3.1 中添加的新“资产管道”相关。
图像未显示的原因可能是由多种原因引起的 -
服务器是否在开发模式或生产模式下运行？ （开发动态编译资产，生产假设它们已被预编译。）
服务器日志中是否出现任何与“rails.png”相关的消息？
It's related to the new "asset pipeline" added in Rails 3.1.
The reason the image isn't showing up could be caused by multiple things -
Is the server running in development or production mode? (Development compiles assets on the fly, production assumes they have been pre-compiled.)
Do any messages appear in the server log relating to "rails.png"?
它是默认的 Rails 主页。当您单击有关应用程序环境的链接时，它会显示您的本地配置环境。您无需在此页面上执行任何操作。您需要设置默认主页来代替此页面。是的，安装没有任何问题。
Its a default rails home page. It shows your local configured environment when you click on link about your applications environment. You need not to do anything whit this page. In place of this page you need to set your default home page. And yes there is nothing wrong with the installation.
简单来说，Rails 已经与教程中的内容发生了变化，请尝试使用计算机上的 Rails 版本检查新内容，最好是确保您在实践中使用教程中相同版本的 Rails，否则您会最终可能会感到困惑
Simply means Rails has changed from what you have in the tutorial, try to check up the new things with the version of rails you have on your machine, best is to ensure you are using the same version of rails from the tutorial in practice else you might end up confused