在跟踪单上会创建一个自定义优先级字段，此字段根据项目计划而更新，并且按照开发人员执行任务的正当顺序传达给他们。
A custom priority field was created on the tracking tickets, updated based on the project plan, and dictated to each developer in the order they should perform their tasks.
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.
优先级字段包含一个关键字，例如 debug、info、notice 或者 warning。
The priority field contains a keyword, such as debug, info, notice, or warning.
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