Source control allows you to "roll back" to a previous iteration of a file to restore the status quo or to recover from an error.
源代码控制系统允许用户“回滚”到以前的文件版本，从而恢复以前的状态或从错误中恢复。
The original file system must be unmounted before executing the roll back.
在执行回滚之前，必须卸载原始文件系统。
The first thing you need to do in getting Quick ready to roll is create a QDML file.
您需要让 Quick 准备做的第一件事情是创建 QDML 文件。
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