sunspot group

例句：

1. 1. The sunspot group is responsible for the solar flares.
   太阳黑子群负责引发太阳耀斑。
2. 2.The study of sunspot groups has led to new insights into solar activity.
   研究太阳黑子群已经揭示了对太阳活动的新见解。
3. 3.The sunspot group's behavior is closely monitored by astronomers.
   太阳黑子群的行为由天文学家密切监测。