它不能向数据库中添加文档、从数据库中删除文档、修改已有的文档或者其他操作，这是其功能中的一个很大漏洞。
It can't add documents to the database, delete documents from the database, modify existing documents, or do anything else, which is a pretty gaping hole in its capabilities.
当进行少量更改时，例如添加或删除数据库列，该功能可以有效地减少数据库管理员对模式的修改操作。
This effectively reduces the need for database administrators to modify schemas when simple changes, such as the addition or removal of database columns, are performed.
编辑功能使您能够添加、删除或修改联系人。
An edit capability allows contacts to be added, deleted or modified.
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