This mountain is made of tuff.

This rock is gabbro.

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.

It is said that this substance has a high carcinogenicity.

Ten hung the laundry outside to dry.

I think '娃' is a very beautiful name.

He pushed open the door and entered the room.