The technologies of content-based retrieval in digital libraries are expounded and the feature selection and storage strategy of the retrieval objects is discussed in the paper.

本文论述了数字图书馆的基于内容的各种检索技术，并讨论了检索对象的特征选择和存储策略。

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But its report emphasised that regular radiation monitoring and retrieval of radioactive objects discovered at Dalgety Bay should continue.

BBC: Dalgety Bay radiation: Particles pose 'low risk' to public