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。
The second method is insufficient because it is still possible to enter an invalid value.
然而，在旧的解决方法无效的情况下需要构建一些新型的应用程序。
However, there are new classes of applications being built where the old approaches break down.
其它方法都无效的情况下，氩氦刀依然取得非常好的效果。
When other modalities become inefficacious , Argon-helium knife still can get very good results.
错误，声明无效。简单的模型方法无法正确运作。
Error, statement invalid. simple model method not functioning correctly.
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。
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。
On condition that traditional method is invalid, new method is in need of.
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