Traditional interactive TV systems depend on expensive hardware, proprietary formats, and a closed-loopend-to-end approach, which greatly limits scalability and extensibility of TV services.
传统的互动电视系统依赖昂贵的硬件、专用格式和端到端的封闭环路,这大大限制了电视服务的可扩展性。
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This means the program statements executed in the loop body must change the value of the expression — or else the loop will never end.