Mammals can maintain a constant body temperature.

I am raising seedlings in the seedbed every day.

He announced his candidacy for mayor.

He announced his candidacy for the mayoral election.

The maintenance of this park is our responsibility.

We have a responsibility to conserve the natural environment.

During a long journey, it is necessary to supply food and water.

We need to supply food for our long journey.

Ryosuke always helps in class.

You can see the true strength of the sumo wrestler in the official sumo tournament.