内容简介
A satellite is a small object travelling around something bigger. The Moon is a natural satellite of Earth. A spacecraft launched into orbit around Earth is an artificial satellite.
卫星是围绕较大物体运行的小物体。月球是地球的天然卫星。发射到环绕地球轨道上的宇宙飞船是一颗人造卫星。
Discover how we use satellites every day to talk on the telephone, watch TV, use the Internet, predict the weather and run businesses
探索我们每天如何利用卫星打电话、看电视、使用互联网、预测天气和经营业务