The art of the deal.
/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.，这一点在Line官方版本下载中也有详细论述
Предварительно работала российская противовоздушная оборона (ПВО).，这一点在safew官方版本下载中也有详细论述
Source: Computational Materials Science, Volume 267