He is deepening his knowledge by reading the encyclopedia.

For now, please give me a cup of coffee.

I am majoring in immunology at university.

He underwent a cerebrospinal fluid test.

The cane toad is causing a big problem in Australia.

The smoker was smoking a cigarette outside the restaurant.

Polyolefin is a type of plastic widely used in the chemical industry.

Where is his place of origin?

Where is his songbun from?

Cycloolefins play an important role in organic chemistry.