... middleware n. 中间（软）件 difficult-to-classify 难以分类 liteware n.（light ware）不具备部分性能的共享软件 ...
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An additional and difficult-to-classify category of software is the utility, which is a small useful program with limited capability.
工具软件是附加的、难以分类的软件，它是一种容量有限、小巧实用的程序。
Fossil finds are notoriously difficult to classify—people disagree on which physiological features are important; and each new find represents a class of one.
对化石发现进行分类是出了名的难——对于各种生理特性重要程度的判定可谓众口难调，而且一有新发现便会编入一个新的分类单位。
Thing is that it's very difficult to classify.
问题是很难进行分类。
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