Stream类终于有从一个流复制到另外一个的方法了。
The Stream class finally has a method for copying from one stream to another.
它先将原始数据流复制成多路并行数据，经频域扩频和时域扩频，再调制到互相正交的子载波上传输。
It copies the original data stream to several parallel data streams, spreads them in both time and frequency domain, then modulates them to orthogonal sub-carriers for transmission.
登录以后，创建一个目录并复制用于消息流的输入文件。
After logging on, a directory was created and an input file for a message flow was copied.
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