He was like a double-dealer, expressing different opinions to two groups.

He put the luggage in the back seat.

He has a very aggressive personality.

The anal sphincter is an important part of the body.

I am taking antihistamines for my allergies.

This perfume contains ambergris, an expensive ingredient.

He put a sticking plaster on his knee.

This antitoxin is used to counteract that toxin.

The next census will be conducted next year.

Demography is a part of social science that studies the structure, evolution, and problems of human population.