It's difficult to understand his explanation.

He increased the time spent together to deepen his relationship with her.

Cultural exchange between Japan and Korea is important for deepening understanding between the two countries.

The exchange with him broadened my horizons.

Interacting with him broadened my horizons.

Exchanges between both countries are becoming more active.

There is a wonderful sumo arena in Ryogoku.

It's difficult to understand his explanation.

Health is very important.

His opinion is very important.