Arsine is a very dangerous gas in chemistry.

This road is dangerous, so please be careful.

Please avoid this road because it's dangerous.

I was amazed at his extraordinary talent.

Please press this button in case of emergency.

It is a very beautiful view.

He is majoring in chemistry at university.

We heat our house with natural gas.

He is an expert in chemistry.

This lake is known as a dangerous body of water.