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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The river, which runs through seven US states that share it, is currently facing the worst drought in 1,200 years.
“现在L3的适用范围（ODD）过窄，无法快速普及。”国家新能源创新中心一位测试工程师表示，当前L3测试适用范围只是集中在市区跟车儒行和高速规定线路行驶，“更多适用范围需要等待法律法规扩充。”，这一点在一键获取谷歌浏览器下载中也有详细论述