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单词 protostar
释义
pro·to·star (prōtə-stär)
n.
A celestial object in a late stage of star formation in which the central condensation resulting from the collapse of a dense, interstellar cloud core has become a sphere that is opaque so that it has a luminous surface like a star, but has yet to sustain nuclear fusion of hydrogen in its core.
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更新时间:2025/3/22 9:54:14