甜润

tián rùn qīng xīn de kōng qì

甜润清新的空气

sweet, fresh and moist air

qiū tiān hé dōng tiān kōng qì cuì ér tián rùn xiàng jiā xīn bǐng gān

秋天和冬天，空气脆而甜润，像夹心饼干。

In autumn and winter, the air was crispy and sweet, like biscuits.