He is fulfilling his role as a window to society.

I purchased this product from a reliable vendor.

I am the person in charge of this project.

The new school building has been completed.

The police said he is a ruthless murderer.

This rolling stock is the latest model of the Shinkansen.

Due to last night's heavy rain, a large amount of earth and sand flowed from the mountain.

Fluorine naturally exists in the Earth's atmosphere.

Fluorine is an important element for dental health.

He slid down the slope on skis.