> For the complete documentation index, see [llms.txt](https://once-upon-a-phd.gitbook.io/once-upon-a-phd/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://once-upon-a-phd.gitbook.io/once-upon-a-phd/skyfall/bei-ou-yi-lu-xiang-bei.md).

# 一路向北

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《北欧，一路向北》 | Helios Xu © 2018 摄影
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