The model file is in MDL format.
模型文件采用的是mdl格式。
An MDL version of the model ensures the model does not bloat or fragment over time when categories are deleted.
mdl格式的模型能够保证该模型不会过于臃肿或者随分类逐渐删除而变得零碎。
If a model has been divided into separate files, the files other than the main (.mdl) file are called subunits.
如果模型被分成单独的文件，那么除了主(. mdl)文件以外的其他文件都称为subunit(子单元)。
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