This chemical reaction is very dangerous.

The water in this area is undergoing arsenication, and it is dangerous to drink.

The chemical reaction to arsenicate this sample is very dangerous.

This specimen was taken from a very rare type of rock.

This road is dangerous, so please be careful.

Please avoid this road because it's dangerous.

We will use arsenic in this chemical experiment.

I was amazed at his extraordinary talent.

Please press this button in case of emergency.

It is a very beautiful view.