Bg - if a mount fails the system keeps retrying in the background and continue.
bg -如果装配失败，系统继续在后台重试，然后继续。
Press Control-Z to suspend a running job; type bg and fg to run a job in the background and foreground, respectively; and type jobs to manage the list of jobs.
按Control - Z可以暂停正在运行的作业；输入bg和fg分别在后台和前台运行作业；输入jobs管理作业列表。
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