My four treasures of the study are a fountain pen, a pencil, an eraser, and a ruler.

He is an expert in international law.

He is an expert in dialectology, studying dialects from all over Japan.

Jus gentium is a universal law that applies to all people.

This law is based on the ancient Banminhō.

In our house, we watch foreign news using satellite broadcasting.

He thought deeply about the result of that juristic act.

The presenter explained the results in detail.

He conveyed her words using reported speech.

He learned how to operate an anti-aircraft gun.