Doctors 1 have recently started 2 to study the cause of a medical disorder 3 that they have appropriately named 6 SAD or seasonal affective disorder. 3
People 1 who suffer 6 from SAD 4 become very depressed 2 during the winter months. 4
Their depression 1 appears to be a result of a decrease 2 in the amount of sunlight 4 they are exposed to. 6
Doctors 1 theorized 2 that decreased sunlight affects 3 (12) the production of melatonin, a hormone 3,
manufctured 6 in the brain, and serotonin, a chemical 4 that help 6 transmit of nerve impulses. 3
Depression 1 may result 2 from the imbalance of two substances 4 in the body 4
*학습방법1
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