我没有在文中介绍相关的概念；参考资料中有相关的背景资料。

I won't cover related concepts; for background information see Resources.

youdao

要了解应用程序的细节和帮助背景信息，请参阅参考资料部分列出的先前的“Hello World”文章。

For applicable details and helpful background information, refer to the previous "Hello World" articles listed in the References section.

youdao

电子书本身支持多媒体功能，比如视频、背景知识和参考资料，点评，引用等内容。 这些多媒体很有可能来自出版商，而不是电子阅读器厂家。

Those multimedia features probably need to come from publishers, rather than eReader manufacturers.

youdao