CNN has reported that some of the materials included top secret files.

CNN 报道称，一些文件还属于绝密级别。

Government lawyers say the documents include top secret files on U.S. nuclear and defense programs.

政府律师表示，这些文件包括有关美国核项目和国防项目的绝密文件。

The audio, which includes more than 1000 separate data files, was captured in the early 1970s by the late Hetty van de Rijt-Plooij.

该音频是已故Hetty van de Rijt-Plooij于20世纪70年代早期录制的，包括逾1000份独立数据文件。