/etc is also writable, but it’s managed a bit differently. OSTree uses a technique called “etc overlay” to handle modifications in /etc. When an update is applied, OSTree compares files in the new version with those in /etc and applies changes intelligently, preserving local modifications as much as possible.
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（二）主动消除或者减轻违法后果的；
'70s were a remarkable era in computer history, though, seeing the introduction，推荐阅读WPS下载最新地址获取更多信息