核磁共振扫描显示，白色斑点出现在前额叶皮层。
On MRI scans, white spots showed up in the prefrontal cortex.
导致这类斑点出现的指甲受伤类型包括指甲撞在门上或工作台上或被锤子砸到等。
Some examples of the types of injuries that can cause these spots are banging the finger on the door or banging it on the countertop or with a hammer.
几个世纪以来，天文学家们记录了这些黑色的斑点出现在太阳表面，几天，几月或者几年后又消逝掉的情况。
For centuries astronomers have recorded when these dark blemishes on the solar surface emerge only for them to fade away again after a few days weeks or months.
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