/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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“L3相比L2，多了更多安全冗余。”北汽一位路试人员表示，L3必须具备相应的安全冗余，比如双芯片并行。当一个芯片“死机”，另一个芯片也能接管车辆。“刹车转向也都是双传感器、双ECU、双电源的设计。”
The British Medical Association (BMA) said 83% of its members had voted to continue with the walkout after ministers said they would not increase doctors' pay.