中文谷sunspot cycle造句怎么写
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Changes to the sunspot cycle will have an impact on our weather and climate — but not a very big one. David Biello reports.
Changes to the sunspot cycle will have an impact on our weather and climate — but not a very big one.
Conditions on the 15 and 10 meter novice band are slowly improving these days, although the current sunspot cycle 23 is now slowly diminishing
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