本规范EPUB Media Overlays 3.0.1定义了[SMIL]（同步多媒体集成语言）、软件包文档、EPUB？样式表和EPUB内容文档的用法，用于表示与EPUB内容文档同步的音频。 本规范是组成EPUB 3的一系列相关规范之一，EPUB 3是基于XML和Web标准的数字出版物交换和交付格式的第三次主要修订版。本规范应与构成EPUB 3的其他规范一起阅读和理解: EPUB 3概述[EPUB3概述]，它提供了EPUB的信息性概述以及EPUB 3其余文档的路线图。 首先应该阅读概述。 EPUB出版物3.0.1[Publications301]，定义了EPUB出版物的每个格式副本的语义和总体一致性要求。 EPUB内容文档3.0.1[ContentDocs301]，它定义了在EPUB出版物的上下文中使用的XHTML、SVG和CSS的概要文件。 EPUB Open Container Format（OCF）3.0.1[OCF301]，它定义了一种文件格式和处理模型，用于将一组相关资源封装到单个文件（ZIP）EPUB容器中。

This specification, EPUB Media Overlays 3.0.1, defines a usage of [SMIL] (Synchronized Multimedia Integration Language), the Package Document, the EPUB？ Style Sheet, and the EPUB Content Document for representation of audio synchronized with the EPUB Content Document. This specification is one of a family of related specifications that compose EPUB 3, the third major revision of an interchange and delivery format for digital publications based on XML and Web Standards. It is meant to be read and understood in concert with the other specifications that make up EPUB 3: The EPUB 3 Overview [EPUB3Overview], which provides an informative overview of EPUB and a roadmap to the rest of the EPUB 3 documents. The Overview should be read first. EPUB Publications 3.0.1 [Publications301], which defines the semantics and overarching conformance requirements for each Rendition of an EPUB Publication. EPUB Content Documents 3.0.1 [ContentDocs301], which defines profiles of XHTML, SVG and CSS for use in the context of EPUB Publications. EPUB Open Container Format (OCF) 3.0.1 [OCF301], which defines a file format and processing model for encapsulating a set of related resources into a single-file (ZIP) EPUB Container.