The study of nekton is an important part of marine biology.

A new play structure has been installed in the park.

I went to the station through the underground passageway.

Yuu is hanging out the laundry.

He saw the character '憂', and remembered his deceased friend.

Akihiro went to see the first sunrise of the year.

Cold fusion is a part of physics and is a phenomenon that is not yet fully understood.

Research on cold fusion is still controversial.

Yuu believed in divine help from God.