以上来源于: WordNet
N a planet in its early stages of evolution by the process of accretion 原行星
Model suggests how protoplanets kept a safe distance from the sun
动态模拟证明原行星是怎样保持与太阳之间有一个安全的距离。
Studying Vesta may give clues to the formative years of our early Solar System, as the unusual world may be one of the largest remaining protoplanets.
研究灶神星或许有助于得到早期太阳系形成的线索，因为灶神星这个不同寻常的世界也许是残留的最大原行星之一。
Both large asteroids, also known as' protoplanets, 'are believed to have formed at the same time and in similar environments as Mercury, Venus, Earth, and Mars.
这两颗较大的小行星也被称为“原行星”，通常认为这两颗小行星形成于同一时间，并且其形成环境与水星、金星、地球和火星相同。
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