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。

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This string is then passed into the VectorSpace module, and a data hash data structure is keyed on the filename for the list of vectors within a file.

随后，此字符串将被传递给VectorSpace模块，并且数据散列的数据结构将依靠文件名来获得文件内的向量列表。

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Add a private variable filename of type String to this class.

将私有变量filename添加到该类中，数据类型为String。

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