This old radio uses a tetrode.

My father is forty-one years old.

This city with its beautiful night view is my favorite.

The moon has risen, and it's time to return the robe of night.

I use plain flour to make bread.

He proposed a new theory about quantum mechanics.

Thanks to his serendipity, we were able to find a new business opportunity.

Intermolecular forces are an important factor in determining the properties of a substance.

Katoriki is a rare name, isn't it?

He rejoiced when he heard about the success.