Who is the person in charge of the project?

New rolling stock has been introduced at this station.

Due to yesterday's heavy rain, earth and sand flowed down from the mountain.

Please be careful as this slope is slippery.

Sumiaki is my best friend.

In math class, I learned about the new concept of mapping.

He came to America as an immigrant when he was young.

I deeply appreciate your help.

I am deeply grateful for your help.

He described the scenery in detail.