The autumn sky is high and the air is crisp - it's the perfect season for an outing.
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usage
Very common seasonal set phrase, used almost exclusively for autumn weather. Often pairs with activities like 出游 (outings), 登高 (climbing heights), or 赏月 (moon-viewing).
history
Traced to Du Fu's Tang-dynasty poem 《崔氏东山草堂》: 爱汝玉山草堂静,高秋爽气相鲜新 - celebrating the fresh, clear energy of deep autumn.