如何下载和安装 macOS - 官方 Apple 支持 (中国) 如果你想重新安装 macOS，通过“软件更新”进行安装未能成功，或者 Mac 因没有可正常运行的操作系统而无法顺利完成启动，你可以从“macOS 恢复”启动，然后从这里重新安装 macOS。
macOS - Wikipedia As a device company, Apple has mostly promoted macOS to sell Macs, with promotion of macOS updates focused on existing users, promotion at Apple Store and other retail partners, or through events for developers
How to download and install macOS - Apple Support If you want to reinstall macOS, or installation using Software Update was unsuccessful, or your Mac doesn't start up all the way because it doesn't have a working operating system, you can start up from macOS Recovery, then reinstall macOS from there