We need to estimate next year's sales.

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.