He works as a neurosurgeon.

This ancient document contains descriptions about the brain.

My dream is to become a neurosurgeon.

His son has a developmental disability, but he is doing his best at a special needs school.

We will use arsenic in this chemical experiment.

There are a lot of arrowheads growing in this pond.

Her ring was shining with a diamond in the shape of a rhombus.

There are a lot of water caltrops growing in this pond.

As I walked through the haze, I could see nothing.

Arsenic is one of the elements widely distributed in nature.