用ThreadLocal简化调试日志纪录。
日志模块分为安全日志、调试日志和跟踪日志；
The log module is divided into safe record, debugging record and trace record.
出于此原因，在生产环境中应该谨慎使用跟踪和调试日志级别。
For this reason, trace and debug logging levels should be cautiously used in a production environment.
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