unavailable device [计] 不可用设备
OS can recover from disk read, device unavailable, transient write failures.
操作系统可以恢复磁盘读，设备无效，暂时的失败。
The invention relates to a voice monitoring method, in particular to a voice monitor in the case of long distance and unavailable arrangement of a voice pickup device.
本发明涉及一种语音监听方法，特别是指在远距离并无法在目标处放置拾音装置的语音监听。
The secondary devices provide support for the primary device when the primary device is unavailable.
当主要装置不可用时，次要装置向主要装置提供支持。
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