在图3中，齿轮箱代表处理一些基础数据结构的抽象，而黄色箱代表可移植代码，将数据封装在里面。
In Figure 3, the gear box represents abstractions that deal generically with some fundamental data structure, and the yellow box represents portable code, encapsulating data inside it.
垃圾箱中的消息设置为过期，在测试过程中每15分钟删除两条消息。
The messages in the trash were set to expire and were deleted at the rate of two messages every 15 minutes throughout the test.
一些测试使用的总邮件文件大小都相同，如 700 MB，但是这些邮件文件是由收件箱中不同数量的文档构成的。
Some tests used mail files of all the same size, such as 700 MB, but were built with varying number of documents in the Inbox.
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