The second method is insufficient because it is still possible to enter an invalid value.
只第二种方法是不够的，因为只用这种方法仍然可能输入无效的值。
Error, statement invalid. simple model method not functioning correctly.
错误，声明无效。简单的模型方法无法正确运作。
On condition that traditional method is invalid, new method is in need of.
在利用传统途径理解系统无效的前提下，需探讨新的系统理解方法。
Rough set method for invalid and absent signal treatment in power station fault diagnosis system;
分析了信号丢失的原因，给出了丢失条纹数的确定方法。
Rough set method for invalid and absent signal treatment in power station fault diagnosis system;
分析了信号丢失的原因，给出了丢失条纹数的确定方法。
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