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.
Last year the US added an average of just 15,000 jobs a month, very few by historic standards.
，这一点在heLLoword翻译官方下载中也有详细论述
输入：target = 12, position = [10,8,0,5,3], speed = [2,4,1,1,3]
Performance tracking