The sample application used here is a simple message board.

这里使用的示例应用程序是一个简单的留言板。

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The sample application does two simple things. It lists all of the messages posted to the message board, and it allows a user to post a new message to the message board.

示例应用程序主要完成两个简单的目标：一是列出张贴到留言板上的所有消息，二是允许用户向留言板张贴消息。

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Half a decade before the inception of Facebook, communities were springing up largely facilitated by the invention of the simple message board.

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