I went shopping with my co-sister-in-law.

He is my rival in love.

On Children's Day, we decorate our garden with a large koinobori.

He is looking for his road of romance.

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

They were put in a situation of confrontation.

He is studying about Einstein's theory of relativity.

We are looking for new partnerships to strengthen our business contact.

This phase diagram shows the state of the substance.

This problem is equivalent to his ability.