The knot was fastened in such a way that it was impossible to undo.
那个结系死了，没法解开。
The way they tell you how to tie the knot is virtually impossible to undo.
他们介绍打结的方法根本不可能轻易解开。
This is because hashing an input value converts it into a new value that is mathematically impossible to undo to produce the original value.
这是因为散列可以将输入值转化为新的值，而这些新值不能从数学上逆向生成原始值。
This is because hashing an input value converts it into a new value that is mathematically impossible to undo to produce the original value.
这是因为散列可以将输入值转化为新的值，而这些新值不能从数学上逆向生成原始值。
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