He explored the old castle that had become ruins.

Japan's foreign policy places importance on peace.

The use of nuclear weapons is prohibited by international law.

This plant grows well in sunny places.

Understanding chemical equilibrium is very important in understanding chemical reactions.

He is highly respected in the education world.

Ikumasa is my best friend.

Mr. Fujiike is my best friend.

He expressed his different opinion at the meeting.

Mr. Yukata is my best friend.