A change in the political party that holds power could greatly change the future of the country.

After finishing reading the official documents, he thought deeply.

A ray of morning sun came in through the window.

All students at this school are enthusiastic about studying.

This antigen triggers a specific immune response.

This vaccine contains the antigen of the new coronavirus.

He took a train to Tokyo in the allative case.

A binary operator is one of the basic concepts in algebra.

This trumpet is made of brass.

I decided to start a new business taking advantage of this favorable opportunity.