It's difficult to understand his explanation.

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

He succeeded very much.

There is a wonderful sumo arena in Ryogoku.

Exchanges between both countries are becoming more active.

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

I am doing volunteer work to contribute to the community.

His research made a significant contribution to the scientific community.

The exchange with him broadened my horizons.

Interacting with him broadened my horizons.