He boarded the fighter plane as a tail gunner.

He is doing special exercises to strengthen his abductor pollicis brevis.

This document contains environment-dependent characters.

This old television uses a cathode ray tube.

He is irritable like a tantrum ball.

Watching his graduation ceremony, I was filled with immeasurable deep emotion.

He escaped from the accident by a hairsbreadth.

In organic chemistry, camphane is an important compound.

In this chemical experiment, we will use camphene as the main component.

The concept of topological space plays an important role in many fields of mathematics.