问题诊断记录：这提供了有关服务问题诊断的信息。

Diagnostics logging: This provides information for diagnosing issues with services.

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一项新的研究把这种推测引入其以往的诊断记录。

Now a new study turns that speculation into a retrospective diagnosis.

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注意，对null值的检查从for语句中消失了，因为希望通过写诊断记录来处理这种情况。

Note that the test for null values is gone from the for statement, because you want to handle that condition by writing a diagnostic record.

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