Another important use of telecommunication satellites was demonstrated in 1974 when the "Teacher in Sky" satellite transmitted educational programs to classes in remote areas of the United States.

1974年，美国“空中教师”卫星把教育节目传送到了偏远地区的教室，这说明了通信卫星的另一个重要用途。

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Using the encapsulation, inheritance and polymorphism of OOP, a foundation class library of small satellite software is designed, the detail design of all base classes is introduced.

利用OOP的封装性、继承性和多态性，设计小卫星软件的基本类库，介绍各个基本类的具体设计思想。

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Using the encapsulation, inheritance and polymorphism of OOP, a foundation class library of small satellite software is designed, the detail design of all base classes is introduced.

利用OOP的封装性、继承性和多态性，设计小卫星软件的基本类库，介绍各个基本类的具体设计思想。

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