美国某公司发明了一种利用卫星的呼叫系统,呼叫范围为美国的任何一个地方,从而解决了无线电呼叫器只能在20～30公里范围内使用这一问题。人们通过电话把存取的代码、回拨的电话号码等信息输入到华盛顿的中心计算机,计算机立即转换并通过通讯卫星把信息发送 A company in the United States invented a satellite-based calling system to call anywhere in the United States to address the problem that radio pagers could only be used within 20-30 km. People access to the code through the phone, call back to the phone number and other information entered into Washington’s central computer, the computer immediately converted and send information through the communications satellite