It's very interesting to learn about the history of the medieval times.

Let's meet at the actual place.

A centralized political system is one in which all power is concentrated in the central government.

I can't forget the taste when I first ate borscht.

He gave me good advice.

He advised me to continue studying.

This stratum is thought to be millions of years old.

The axis of this machine has broken.

It's difficult to find the Big Dipper.

Reading the gloss of this sentence deepens your understanding.