This old radio uses a pentode.

He gripped the control stick and made the airplane ascend.

He was surprised to find a claw cap.

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.

I went to the supermarket with a paper bag.

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.