BSkyB is a perfect example of controlling the endpoint of consumption: you need to have Sky's satellite dishes and Sky's receiver and Sky's encrypted card - tied to a subscription - to view it.
Then, the most statement is about component of terminal receiver system, named data receiving Card, these introductions describes its design principle and implementation.
然后，重点阐述了作为终端接收系统的重要组成数据接收卡的设计理论和设计实现。
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This measurement system consisted of sensors, global position system (GPS) receiver, data acquisition (DAQ) card and computer.