bié ràng shī qì jìnrù dùqí, róngyì shēngbìng.
Don't let moisture enter the belly button; it can easily cause illness.
xiǎo háizi de dùqí shàng yǒuyī kē xiǎo gēda.
There is a small bump on the child's belly button.
dùqí de zhōuwéi hěn mǐngǎn, qiān wàn bié pèng.
The area around the belly button is very sensitive, so don't touch it.