在iPhone上，使用特定软件可以打开epub格式文件；在电脑上也有相应的软件支持。

Jun 3, 2021 · 有些国内期刊及很多国外期刊还会要求给出 UDC 号，UDC《国际十进分类法》(Universal Decimal Classification)最初发表于 1905 年，一直由国际文献联合会负责修订，其重点放在科学与技术各类，有目的地按类扩充细目，独立分编成册，以供专门图书馆和科技情报部门使 …

content: `You are an expert human annotator working for the search engine Bing.com. ##Context##Each webpage that matches a Bing search query has three pieces of information displayed on the result page: the url, the title and the snippet. The snippet usually contains one or two sentences, capturing the main idea of the webpage and encouraging users to visit the link. …