In some cases, the file system can be in such bad shape that the operating system boots into single user mode to allow the user to further the repair process.
而在某些情况下，当文件系统损坏严重时，操作系统会启动到单用户模式，由用户进行进一步的修复。
Each position of the selector must be clearly identifiable and must correspond to a single operating or control mode.
该选择器的每一位置必须能清晰识别，并且对应于单一操作或控制模式。
A mode of operating a computer in which a single computer instruction or part of a computer instruction is executed in response to an external signal.
操作计算机的一种方式，按照这种方式，响应一个外部信号只执行一条计算机指令，或执行一条计算机指令的一部分。
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