FB2 转 MOBI
经典款 Kindle 打不开 FictionBook 文件，转成 MOBI 才能把 FB2 里的书装进老款 Kindle。
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FB2
FictionBook — an open, XML-based ebook format especially popular in Eastern Europe and well supported by reading apps.
MOBI
An older Amazon Kindle ebook format, still supported by classic Kindle devices.