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.
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（三）非法运输、买卖、储存、使用少量罂粟壳的。
典型案例六：航空基地飞机管路系统及隔热降噪零部件制造基地项目