The Mesolithic is the era between the Paleolithic and the Neolithic.

His car broke down, but the small mercy was that it broke down near his house.

He taught me how to calculate the geometric mean.

He fractured his metatarsal bone.

The Second Sino-Japanese War was a war that lasted from 1937 to 1945.

This shop is currently open.

After he solved the problem, he said, 'It's like seeing the true form of a ghost or a withered silver grass,' meaning things are not as scary as they seem.

He was working on that project round the clock.

We enjoy picnicking in this park year-round.

He is working round the clock.