The occlusion is the main characteristic of ancient library, the article analyzes its reason of occlusion from four aspects:the book quantity, the readers group, book collectors and social background.

封闭性是古代藏书楼的主要特征，文章从图书数量、读者群、藏书家和社会环境四个方面分析其封闭性产生的原因。

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As I walked gathered a quantity of plants, promising myself to buy a book on the morrow and identify them all.

我一边走着，一边采集了大量植物，许下心愿翌日要去买本书，把它们全部辨认出来。

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The sales department will need to extract only the name of the book, its item ID and the quantity ordered; because this is insensitive information it can remain insecure.

销售部门只需抽取出书名、它的项标识以及订购数量；因为这些信息是它可以保留的无需安全的不敏感信息。

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