The noun 蛹 (yǒng) means 'pupa' or 'chrysalis,' the stage in an insect's life cycle between larva and adult. During this stage, the insect undergoes metamorphosis inside a protective casing. It is most commonly used when discussing the life cycle of butterflies, moths, and other insects.
毛虫变成蛹以后,外面会形成一层硬壳。
Máochóng biàn chéng yǒng yǐhòu, wàimiàn huì xíngchéng yī céng yìng ké.
After a caterpillar becomes a chrysalis, a hard shell forms on the outside.
这只蛹过几天就会变成蝴蝶了。
Zhè zhī yǒng guò jǐ tiān jiù huì biàn chéng húdié le.
This chrysalis will turn into a butterfly in a few days.
他小心翼翼地观察树枝上的蛹。
Tā xiǎoxīnyìyì de guānchá shùzhī shàng de yǒng.
He carefully observed the chrysalis on the branch.