1 sentence for 气囊 (qì​náng — air sac)

1. 鸟类的气囊可以帮助它们在飞行时减轻体重并辅助呼吸。

   niǎo​lèi de qì​náng kě​yǐ bāng​zhù tā​men zài fēi​xíng shí jiǎn​qīng tǐ​zhòng bìng fǔ​zhù hū​xī.

   Air sacs in birds help reduce weight and assist in breathing during flight.

   Source: Dong Chinese Dictionary