This old radio uses a tetrode.

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.