A chicken egg needs 21 days to hatch and become a chick.
Cantonese
只母鸡喺度孵蛋。
隻母雞喺度孵蛋。
The hen is sitting on and incubating her eggs.
Cantonese
人工孵化
人工孵化
jan4 gung1 fu1 faa3
artifical incubation
Examples (Wiktionary)
Mandarin
而当小企鹅被孵出,妈妈还没回来时,企鹅爸爸则吐出自己的胃液,来哺育孩子。
而当小企鹅被孵出,妈妈还没回来时,企鹅爸爸则吐出自己的胃液,来哺育孩子。
From : 1996 , 劉墉 [ liu yong ] , 《 生生世世未了緣 》 , pa ge 166
And when the little penguin hatches out and its mom has still not come back, the penguin dad would spit out his gastric juice and feed it to his child.