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单词
active sun
释义
WordReference Random House Unabridged Dictionary of American English © 2024
ac
′
tive sun
′
,
[
Astron.
]
Astronomy
the sun at a maximum of solar activity, occurring every 11 years.
Astronomy
solar activity, superimposed on an unchanging background. Cf.
quiet sun, solar cycle.
1975–80
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更新时间:2025/11/16 8:22:54