这种症状是由于日光不足引起的，因为大脑不能生成调节情绪所必需的血清素。
It is caused by the brain not receiving enough daylight which is needed to trigger serotonin, a hormone that regulates mood.
这种症状是由于日光不足引起的，因为大脑不能生成调节情绪所必需的血清素。
It is caused by the brain not receiving enough daylight which is needed to trigger serotonin, a hormone that regulates mood.
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