What is this box used for?

They hold meetings frequently to deepen their mutual understanding.

Many people gathered for his funeral.

Various types of seaweed are growing in this pond.

I sent him an email.

He runs in the park every day.

I happened to meet him in the city.

Souta lived strongly like a storm, yet quietly.

Water turning into ice is an example of a phase transition.

His ideal is world peace.