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单词 θ906
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the world > the universe > sun > solar activity > [noun] > mark on sun > sunspot > specific period of low activity (1)
Maunder minimum1975

A period of extremely low solar activity and a near absence of sunspots; spec. (historical) the one which occurred between about 1645 and 1715, and…

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更新时间:2024/9/21 8:30:18