FB2 转 EPUB
离开专门的 FictionBook 应用，FB2 的支持就很有限，转成 EPUB 后几乎所有阅读器都能打开同一本书。
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FB2
FictionBook — an open, XML-based ebook format especially popular in Eastern Europe and well supported by reading apps.
EPUB
The open ebook standard used by most readers and stores. Text reflows to fit any screen size.