这个词是什么意思？
The fifth planet in order from the sun. It is one of the five outer planets of the solar system. Its sixteen natural satellites include Callisto, Europa, Ganymede, and Io.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D018538 · MeSH 2026。
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