Part of this movie is based on actual events.

We should do our best to defend our country.

He is doing his best for the defense of the country.

This system is very efficient.

This ancient artifact is very valuable.

It is very interesting to learn about ancient history.

I am planning to go to Seki City in Gifu Prefecture next week.

His character affects all the people he is involved with.

This barrier was part of the ancient defense system.

It's difficult to overcome this barrier.