This device operates using a circular current.

This old science book explains the concept of circular current in detail.

I measured the current using an ammeter.

That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.

Do you understand the necessity of this project?

There is a New Year's celebration in January.

The tip of this pen is only 1 millimeter.

He always likes to be the first to comment on videos.