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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The domain offers retrieval and maintenance services for the business object, encapsulating business logic, location, and the format associated with its objects and services.

域为业务对象提供服务检索和维护、封装业务逻辑、定位以及与对象和服务相关联的格式。

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Deleting an object from the database works along the same lines as retrieval and update: By default, when an object is deleted, none of the objects it references are deleted with it.

从数据库中删除对象与检索和更新对象类似：默认情况下，删除一个对象时，不删除它引用的对象。

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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