• vpn: This likely stands for "Virtual Private Network," which is a technology that allows users to access the internet over the internet without needing a dedicated server or account. It's commonly used for accessing websites, forums, or other online services.

• 天行: This translation could refer to "skyways" in some contexts, though it's not widely recognized. If you're referring to a specific term, it might be worth checking if it's a typo or if there's additional context that could clarify its meaning.

If you have more context or if "天行" refers to something specific, please provide additional details so I can assist you better.