// 步骤2：倒序遍历（从最后一个人往前推，符合"找右侧元素"的直觉）
首次启动会拉大量镜像，时间可能较长。，推荐阅读夫子获取更多信息
But of course, like any immutable system, there are mutable parts (otherwise, we couldn’t create any configuration files). OSTree handles this with “overlays” (actually, we use OverlayFS) that allow a read-write filesystem to be layered on top of the immutable system. For example, the /etc and /var directories are writable, while the rest of the system is read-only.。业内人士推荐下载安装 谷歌浏览器 开启极速安全的 上网之旅。作为进阶阅读
Жители Санкт-Петербурга устроили «крысогон»17:52，更多细节参见搜狗输入法下载