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sun·spot AHD[sŭnʹspŏt'] D.J.[ˈsʌnˌspɒt]K.K.[ˈsʌnˌspɑt]n.(名词)a magnetogram illustrating magnetic activity associated with sunspotsPhotoDisc, Inc.- Any of the relatively cool dark spots appearing periodically in groups on the surface of the sun that are associated with strong magnetic fields.黑子:周期性地成群出现在太阳表面的温度相对较低的暗点,与强磁场有关
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