回溯至够远的话，每个人都是从一个地方移到别的地方。
Go back far enough, and everyone moved somewhere from somewhere else.
Class模型及Interaction图回溯至前面描述的用例，如图2和图3所示。
The Class model and the Interaction diagram trace back to the use case described here previously, as Figures 2 and 3 illustrate.
回溯至1993年，Debian被公认为至今为止测试最全面，bug最少的发行版之一。
Dating back to 1993, Debian is currently known as one of the most well-tested and bug-free distros available today.
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