He is studying the shape of the inner lip of the shell.

The columellar lip of this shell has a very beautiful shape.

This shell's outer lip has a very beautiful pattern.

In Sanskrit phonology, the sounds within the lips are very important.

She seemed nervous, biting her lower lip.

She seemed nervous, biting her lower lip.

He bit his both lips trying to hide his nervousness.

He has a deep interest in archaeology.

We use the lunar calendar to determine the date of the festival.

She discussed the health of her 陰脣 with the doctor.