The best way to solve the problem is mail scanning and filtering.

解决这个问题的最好办法就是对电子邮件的扫描过滤。

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Data sparsity problem is a potential challenge of collaborative filtering.

数据稀缺性问题是协同过滤技术面临的主要挑战。

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Data sparseness is a serious problem in collaborative filtering system.

数据稀疏性是协同过滤系统面临的一个巨大挑战。

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Data sparseness is a serious problem in collaborative filtering system.

数据稀疏性是协同过滤系统面临的一个巨大挑战。

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