太阳黑子周 tàiyánghēizǐzhōu sunspot cycle Definitions Defs Origin Strokes Stroke Words Sentences Sents 太阳黑子周 太陽黑子周 tàiyánghēizǐzhōu sunspot cycle the periodic change in the number of sunspots observed on the sun's surface
太阳黑子周 太陽黑子周 tàiyánghēizǐzhōu sunspot cycle the periodic change in the number of sunspots observed on the sun's surface
