The content in this paper involve theory and practicability, and can provide directly reference for engineering.

本文内容具有坚实理论基础和实用性，可直接为工程提供参考。

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Most of them involve a theory arguing that the company wants to work with content producers to deliver an a la carte cable service that would provide a greater choice to consumers.

FORBES: Apple Testing Large-Screen High-Resolution TV Concept

However, theory has held that such novae do not involve such cataclysmic processes that give rise to gamma rays.

BBC: Gamma rays from nova explosion surprise astronomers

Under this theory, a president's obstruction and perjury must involve concealment of official actions.

CNN: Transcript: Judiciary Committee impeachment hearing