| 单词 | satellite |
| 释义 | satellite 1(natural satellite) A relatively small natural body that orbits a planet. For example, the earth's only natural satellite is the moon. 2(artificial satellite) A man-made spacecraft that orbits the earth, moon, sun, or a planet. Artificial satellites are used for a variety of purposes. Communication satellites are used for relaying telephone, radio, and television signals round the curved surface of the earth (see synchronous orbit). They are of two types: passive satellites reflect signals from one point on the earth's surface to another; active satellites are able to amplify and retransmit the signals that they pick up. Astronomical satellites are equipped to gather and transmit to earth astronomical information from space, including conditions in the earth's atmosphere, which is of great value in weather forecasting. |
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