The most common layout object is PatternLayout, which formats messages according to a supplied pattern.
最常见的layout对象是PatternLayout，它根据所提供的模式对消息进行格式化。
The messages are formatted according to the layout (PatternLayout, in this case) associated with the appender.
这些消息是根据与这个添加器相关的layout（在这种情况中是 PatternLayout）进行格式化的。
The two that are configured after that are stdout and R. You can see that stdout is associated with a ConsoleAppender, and then given a PatternLayout.
之后配置的两项是stdout和 R。您可以看到 stdout与一个ConsoleAppender关联，然后被赋予一个 PatternLayout。
The two that are configured after that are stdout and R. You can see that stdout is associated with a ConsoleAppender, and then given a PatternLayout.
之后配置的两项是stdout和 R。您可以看到 stdout与一个ConsoleAppender关联，然后被赋予一个 PatternLayout。
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