He quoted the proverb 'Autumn deer are drawn to the flute' to explain the tendency of people to act for their own benefit.

He was observing the distant birds using binoculars.

This area is rich in peridotite.

This mountain is made of tuff.

This rock is gabbro.

He is majoring in petrology at university.

The students lined up in response to the teacher's instructions.

He cleaned the bowl of the pipe thoroughly.

This cigarette contains carcinogens.

I used binoculars to observe birds in the mountains.