EPUB 转 LRF
把 EPUB 电子书转成 LRF 这种早期 Sony Reader 认得的原生格式，直接喂给它就能读。
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EPUB
The open ebook standard used by most readers and stores. Text reflows to fit any screen size.
LRF
The native ebook format of early Sony Reader devices. Rarely seen today outside older Sony libraries.