I collected several carrier shells on the beach.

The beach was covered in mason shells.

I found some clean shells on the beach.

The valence shells of the atoms determine their chemical properties.

The back shells of the turtles are hard and protective.

The soldiers found several blind shells in the field.

I collected several date shells on the beach.

The electron shells surround the nucleus of an atom.

I found a bag of lentil shells in the pantry.

I found a pile of mask shells on the beach.