Michael Hugos quoted a white paper by Glenn Vanderburg, which divided the feedback loops into three levels.

Michael Hugos引用了Glenn Vanderburg编写的白皮书，其中将反馈循环分为3个级别。

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Named after Hugo Gernsback, the editor of groundbreaking sci-fi magazine Amazing Stories, the Hugos (originally the Science Fiction Achievement Awards) have been awarded annually for science fiction and fantasy writing since 1953.

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