seasonal affective disorder

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌseasonal afˌfective disˈorder noun [uncountable]  an illness that makes people feel sad and tired in winter, because there is not enough light from the sun 季节性情感紊乱，季节性情感障碍 SYN SAD

ˌseasonal afˌfective disˈorder nounChineseSyllable  

seasonal affective disorder
ˌseasonal afˌfective disˈorder noun [uncountable]
an illness that makes people feel sad and tired in winter, because there is not enough light from the sun
   SYN  SAD

seasonal affective disorderBrE /ˌsiːzənl əˈfektɪv dɪsɔːdə(r)/ 🔊NAmE /ˌsiːzənl əˈfektɪv dɪsɔːrdər/ 🔊 noun [uncountable] (abbreviation SAD) a medical condition in which a person feels sad and tired during late autumn/fall and winter when there is not much light from the sun 季节性情感障碍（秋冬两季因白昼缩短而易发作的抑郁症）