This variable is a string and its value is the fully qualified path and filename of your trace properties file.
此变量是一个字符串且它的值是您的跟踪属性文件的完全限定路径和文件名。
The table below describes what each trace level value corresponds to.
下表描述了每个跟踪级别相应的值。
Due to the very detailed and technical content of trace events, they are often only of value to the person who wrote the application.
由于跟踪事件的内容极为详细，而且是技术信息，因此经常只对编写应用程序的人有价值。
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