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概述图文电视原理，证券行业交易模式现状及制约因素，具体介绍了图文电视卡、远程委托及在证券行业的应用，并给出一个实例。
An overview of the principle of teletext, the status quo and the constraints of the securities industry trading patterns, the specific introduction of the teletext card, remote commissioning and the securities industry, and gives an example.