名词
中文翻译：空回状态
同义词：
['null state', 'null response', 'unresponsive state']
例句：
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1. The system is in a null-recurrent state when no input is received.
当没有输入时，系统处于空回状态。
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2.The machine was in a null-recurrent state after the power failure.
电力中断后，机器处于空回状态。
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3. The researchers found that the device was in a null-recurrent state due to a software bug.
研究人员发现，由于软件错误，该设备处于空回状态。