本人在北京时间 9 月 21 日更新了 watchOS 3 与 macOS 10.12 ，尝试使用 Apple Watch 解锁 Mac 的新特性，遇到了一些问题，在此记录。

Sept. 21st, I updated my devices to watchOS 3 and macOS 10.12, trying Apple Watch’s new feature unlocking the Mac. And there were some matters occurred, which was the reason why I logged them here.

  “系统偏好设置”内“安全性与隐私”设置中可以找到“允许 Apple Watch 解锁 Mac ”的勾选项，但仅在满足 watchOS 3 + macOS 10.12 + 开启“双重认证”／“两步验证”的情况下会显示。