我知道这是一个非常开放的问题，但有谁知道我如何确定用户是否在公共交通工具上？ 理想情况下，我有一个后台服务运行，只有在公共交通工具上的订阅者才会收到我的警报。
I know this is a very open question, but does anyone know how I can determine if a user is on public transport? Ideally, I'd have a background service running such that only subscribers who are on public transport receive my alerts.
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