临时创建的字段sort用于ORDER by子句内，以便按深度优先顺序获得返回的结果。

The temporarily created field SORT is used within the ORDER BY clause, to get the result returned in the depth-first sequence.

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常量—终态静态字段和临时终态本地变量—全部适用大写字母，并以下划线分隔各词，如MAX_CONNECTIONS。

Constants - final static fields and occasionally final local variables - are written in all uppercase with underscores separating the words, as in MAX_CONNECTIONS.

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表单的数据包含在实例(instance)(马上有更多介绍)中；它包括所有的表单字段以及任何必需的临时存储器。

The form's data is contained within the instance (more on that shortly); it includes all of the form fields as well as any necessary temporary storage.

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