He worked hard all day long.

He is working all day long.

He started calculating to obtain the ratio of the two numbers.

Workers of the world, unite, the time has come to show our strength.

The International Workers' Association is historically an important organization.

He injured his arm in a workplace accident.

We need more labor force to make this project successful.

The labor market situation is tough.

My father is the leader of a labor union.

He was able to escape from the situation of forced labor.