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.
在你的代码开头，我们看到了这样的设定：
，更多细节参见Line官方版本下载
const curHeight = nums[i]; // 当前位置的身高
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