| 单词 | space probe |
| 释义 | space probe An unmanned spacecraft that investigates features within the solar system. A planetary probe examines the conditions on or in the vicinity of one or more planets and a lunar probe is designed to obtain information about the moon. Probes are propelled by rocket motors and once out of the earth's gravitational field use their propulsion systems for course changes. Many are powered by panels of solar cells, for both internal operation and radio communications |
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