nostril

The cold winter air stung his nostrils as he took a deep breath.

(Chinese) 当他深呼吸时，冬天的冷空气刺痛了他的鼻孔。

The horse's nostrils flared after it finished the high-speed race.

(Chinese) 那匹马在跑完高速比赛后，鼻孔因喘息而张大。