There is a wonderful sumo arena in Ryogoku.

Exchanges between both countries are becoming more active.

We entered into a contract with a new business partner.

We have entered into a contract with a new business partner.

We hold meetings every week to strengthen teamwork.

In order to succeed in this project, it is necessary to strengthen teamwork.

Yuko is my best friend, he always helps me.

We have built a long-standing friendship.

This treaty was concluded to strengthen the friendly relations between the two countries.

We have maintained a good relationship for a long time.