He bit his both lips trying to hide his nervousness.

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.

A labiodental is a sound produced using the lips and teeth.

In female anatomy, the labia occupy an important part.

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

He has a deep interest in archaeology.

He understands the importance of learning.

He is majoring in psychology.