It's difficult to understand his explanation.

Cultural exchange between Japan and France greatly contributes to deepening the understanding of both countries.

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

He succeeded very much.

His research made a significant contribution to the scientific community.

I am doing volunteer work to contribute to the community.

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.