project of gutenberg
古腾堡计划
以上为机器翻译结果，长、整句建议使用 人工翻译 。
During the lifetime of Project Gutenberg alone, the average time a book stayed in copyright in America rose from 30 to almost 100 years.
ECONOMIST: Michael Hart
Project Gutenberg and Archive.org are the two main online repositories of downloadable texts.
BBC: Free e-books provide unlimited holiday reading
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