The fundamental format of the file system is based on a single B+ tree, which makes search operations efficient and very scalable.

该文件系统的基础格式建立在单一的 B+ 树的基础之上，这使得搜索的效率和可伸缩性增强。

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The former method USES a single file to hold all of the E-mail, occasionally changing this to a system where a single file holds the mail for each folder.

前一种方法使用单个文件来保存所有的电子邮件，有时可能将其更改为一个系统，其中使用单个文件来保存每个文件夹的邮件。

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This font comes in a single file; by default it is not installed on the user's system.

该字体放在一个单独的文件中，默认情况下，字体不用安装到用户的系统上。

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