LRF 转 EPUB
LRF 从头到尾只在早期的 Sony Reader 上能用，转成 EPUB 后同一本书在任何现代设备上都能打开。
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LRF
The native ebook format of early Sony Reader devices. Rarely seen today outside older Sony libraries.
EPUB
The open ebook standard used by most readers and stores. Text reflows to fit any screen size.