He underwent surgery on his vertebral column.

There are many beneficial insects in this garden.

There are many beneficial insects in this garden.

There is a large stone pillar in the park.

The theory of the multiverse is particularly interesting in the field of physics.

She is now preparing to wean her son.

Weaning a baby is a difficult task for parents as well.

My younger brother got infected with pinworms.

My younger sister got infected with pinworms.

This 蟯蟲 is a very rare type of parasite.