If you just scramble a sentence, it's pretty useless because the recipients are never going to be able to reverse the process.
如果你只是加密一个句子，这是毫无用处的,因为收件人没法将这个句子,反加密出来。
哈佛公开课 - 计算机科学课程节选
Instead of working to a pre-arranged formula, a generator (ie, a parser in reverse) is brought into play to create a sentence structure in the target language.
ECONOMIST: A gift of tongues
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