Let me give you an example: many people walk through streets listening to music on their iPods. What that means is that someone can easily creep up from behind and attack.
举个例子，许多人走路过街的时候用iPod 听音乐，这样很容易让人尾随，从背后袭击。
The most important files to backup are probably your documents, pictures, music, and other user files, but they are not the only files that you need to backup. Let's walk through some of them.
要备份的最重要的文件大概是你的文档，图片，音乐以及其他用户文件，但要备份的不单单是这些，请接着看下去吧。
Persons have been said to climb on roofs, solve mathematical problems, compose music, walk through Windows, and commit murder in the sleep.
据说梦游者能睡着觉爬屋顶，解数学题，作曲，穿窗而过和行凶杀人等。
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