Case charging: USB-C
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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.，更多细节参见safew官方下载
这种激光器是军方的“蝗虫”系统，由AeroVironment Inc.制造。。业内人士推荐旺商聊官方下载作为进阶阅读
siftDown(arr, i, 0); // 对剩余i个元素重新建堆