These two variables are directly proportional.

This system is very efficient.

It is said that the education system in Japan is strict.

The mayoral election will be held next week.

We elected a new mayor.

This game has a limit on character level-ups.

In order to rent this apartment, you need to pay a deposit first.

My brother works as a systems analyst.

My computer needs a new operating system.

The new apartment is equipped with the latest unit kitchen.