求翻译：两个不同的序列可以对应相同的z变换，而收敛域并不相同，因此，为了使序列和z变换是一一对应，在给出序列z变换的同时，必须指定其收敛域。是什么意思？

Two different sequences can correspond to the same z-transform, and convergence is not the same domain, therefore, in order to correspond to the sequence and z transform, z-transform in the sequence given at the same time, you must specify its domain of convergence.

Two different series in the same z - it can be converted, and astringent domain does not have the same sequence and, therefore, in order to enable z transform is 11, in response to the sequence z transforms, must designate their astringent domain.

Two different sequences may correspond the same z transformation, but the convergence domain is not same, therefore, in order to cause the sequence and the z transformation is 11 correspondences, while gives the sequence z transformation, must assign its convergence domain.

Two different sequences can correspond to the same z-transform and convergent fields are not the same as, therefore, in order for the series and the z transform is one by one, to the z transform of a sequence at the same time, you must specify its domain of convergence.

Two different sequences can correspond to the same z-transform, and convergence is not the same domain, therefore, in order to correspond to the sequence and z transform, z-transform in the sequence given at the same time, you must specify its domain of convergence.