Users therefore can search by title, by author, by subject, and often by keyword.
所以用户们可以根据标题、作者、主题，经常是关键字来搜索。
Often an application must restrict access to its data by particular users.
通常，应用程序必须限制特定用户对其数据的访问。
Often an application must restrict access to its data by particular users.
通常，应用程序必须限制特定用户对其数据的访问。
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