However, when the order of ARMA model is very high, to compare every candidate model's criterion value is computationally infeasible.
但是，当模型的阶数很高时，无法计算并比较每一个备选模型的准则函数值。
It is easier to compute a message digest from a password and computationally infeasible to compute the password based on its message digest.
从密码来计算消息摘要是比较简单的，但以消息摘要为基础来计算密码却是不可行的。
A cryptographic hash function has the property that it is computationally infeasible to find two distinct inputs that hash to the same value.
加密哈希函数有这样一个属性：在计算时不可能将两个不同的输入通过哈希算法取为相同的值。
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