Bibliographical information is the most stable and reusable part in information resource system.

文献信息是信息资源体系中最为稳定并可重复利用的部份。

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If you went to a fast food restaurant and purchased a packet of fries and a burger then the fries can be placed in a free bag as they are only part wrapped and you would not be expected to place these in a reusable bag as there could be some food safety risks.

BBC: Quiz: When do you have pay for a carrier bag in Wales?