原因如下：首先，网络广播支持声音、文本和视频。
The reasons are as follows: first of all, the network broadcast supports voice, text and video.
数据广播是一种能将文本、图形、视频、音频、数据等传输到机顶盒等智能设备的一项技术。
Data broadcasting is a technique that can transmit text, graphics, video, audio, data to an intelligent equipment, such as STB.
数据广播系统能够为用户带来更多的图形、文本、游戏、数据下载、在线升级等功能，在网络支持的情况下还能够实现交互功能。
Data broadcasting system bring more functions for user, such as graphics, text, online upgrades, games and data download, and etc. And it can also support interactive features if network supported.
用于普通话语音合成的《韵律标记文本》的设计，第三届全国语音学研讨会论文集，北京：北京广播学院。
The design of Prosodic Labeling Text for the phonetic synthesis of Standard Chinese, Proceedings of the 3rd National Symposium on Phonetics. Beijing Broadcasting Institute, Beijing.
用于普通话语音合成的《韵律标记文本》的设计，第三届全国语音学研讨会论文集，北京：北京广播学院。
The design of Prosodic Labeling Text for the phonetic synthesis of Standard Chinese, Proceedings of the 3rd National Symposium on Phonetics. Beijing Broadcasting Institute, Beijing.
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