| 单词 | planetesimals |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔planetesimal hypothesis〕The hypothesis that the planets and satellites of the solar system were formed by gravitational aggregation of planetesimals.星子假说：认为太阳系的行星和卫星是由星子靠万有引力集聚而形成的假说美国传统 |
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