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1. Oxford American Dictionary

   solar minimum

   • n.
     the period in the sunspot cycle when solar activity is lowest and sunspots are least abundant

   • noun: solar minimum, plural noun: solar minimums

2. • 釋義

   n.

   名詞

   • 1. the period in the sunspot cycle when solar activity is lowest and sunspots are least abundant in 2009 the sun was at its solar minimum, the quiet phase in its 11-year cycle of activity