·2,447,543篇论文数据，部分数据来源于NoteExpress
数字服务也可以是交互式的，允许民意测验和智力竞赛的节目，文字电视广播改良后的译本和照相视角的选择。
The digital services also will be interactive, allowing participation in polls and quiz shows, improved versions of Teletext, and a choice of camera angles on some coverage.
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