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单词
sunspot cycle
释义
WordReference Random House Unabridged Dictionary of American English © 2024
sun
′
spot cy′cle,
[
Astron.
]
Astronomy
the cycle, averaging in duration slightly more than 11 years, in which the frequency of sunspots varies from a maximum to a minimum and back to a maximum again.
Cf.
solar cycle.
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long-
long
longa
long account
long-acting
long-ago
longan
long-and-short work
longanimity
long arm
long barrow
long beach
longbeard
longbenton
longboard
longboat
longboat key
long bone
longbow
longbowman
long branch
long card
long-case clock
longcase clock
long-chain
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更新时间:2026/6/26 16:06:56