时报既没有加密电话，也没有无声区。
The Times doesn't have encrypted phone lines, or a Cone of Silence.
本课题提出基于DSP的数字加密电话的设计与实现。
The issues about the based on the DSP of digital encryption telephone design and implementation.
因此数字加密电话必然成为保密通信中的主流发展趋势。
So the digital encryption telephone will be widely obtained in the future.
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