【雅思考官最想听到的表达182】comprise 和 constitute...

Comprise and Constitute

Comprise: [going from big thing to the small parts]

When we describe a larger thing, and we say what it contains

The USA comprises 50 states.

The USA is comprised of 50 states. (Passive, more common and sounds better)

Constitute:[ going from small parts to the big thing]

means one of the parts of something.

50 states constitute the USA.