He is a world-renowned researcher.

My laboratory is on the third floor of the university.

He is known as an excellent researcher.

We are focusing on the research and development of new products.

I conducted a research project as a summer vacation homework.

Doubting the existence of this world is part of philosophy.

Zaijiro is my best friend.

The coexistence of humans and nature is important for the sustainability of the Earth.

Humans and nature should coexist.

The opposition party is making harsh criticisms against the government's policies.