pro·to·plan·et 
(prōtō-plăn′ĭt)
(prōtō-plăn′ĭt)n.
A mass of material within a planetary disk that is thought to be an early stage in the formation of a planet.
| 单词 | protoplanet |
| 释义 | pro·to·plan·et (prōtō-plăn′ĭt)n. A mass of material within a planetary disk that is thought to be an early stage in the formation of a planet. |
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