First of all, the main operator role in critical information infrastructure is unknown.

首先，学说中关于关键信息基础设施的主要操作者角色不明。

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Then an operator is introduced from the viewpoint of fault detection to describe quantitatively the influence of the continuous-time unknown inputs and faults on the discrete-time residuals.

然后从故障检测的角度引入算子，定量考察连续时间未知输入信号和故障信号对离散时间残差信号的影响。

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Unknown argument for ':' operator.

运算符“：”的参数未知。

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