Surge Mac 3 价格说明和老用户升级方案 – Surge 帮助中心
https://nssurge.zendesk.com/hc/zh-cn/articles/360010227153-Surge-Mac-3-%E4%BB%B7%E6%A0%BC%E8%AF%B4%E6%98%8E%E5%92%8C%E8%80%81%E7%94%A8%E6%88%B7%E5%8D%87%E7%BA%A7%E6%96%B9%E6%A1%88