Yahoo奇摩字典 網頁搜尋

搜尋結果

1. Oxford American Dictionary

   sunspot cycle

   • n.
     the recurring increase and decrease in the number of sunspots over a period averaging about eleven years

   • noun: sunspot cycle, plural noun: sunspot cycles

2. • 釋義

   n.

   名詞

   • 1. the recurring increase and decrease in the number of sunspots over a period averaging about eleven years typically, around the end of each sunspot cycle, the sun's magnetic fields switch direction