| 单词 | SAD |
| 释义 | SAD [ˌes.eɪ'di:] noun uncountable abbreviation for ■seasonal affective disorder: a medical condition in which a person does not have much energy and enthusiasm during the winter because of the reduced period of natural light 季节性不适（冬季因日照时间缩短而引发的精力不济） |
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