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单词
protostar
释义
WordReference Random House Unabridged Dictionary of American English © 2024
pro•to•star
(prō
′
tō stär′),
USA pronunciation
n.
[
Astron.
]
Astronomy
an early stage in the evolution of a star, after the beginning of the collapse of the gas cloud from which it is formed, but before sufficient contraction has occurred to permit initiation of nuclear reactions at its core.
proto
- +
star
1945–50
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更新时间:2025/12/19 9:29:21